B.A.T.M.A.N March 2015

b.a.t.m.a.n@lists.open-mesh.org

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40 discussions

[B.A.T.M.A.N.] [PATCHv2] Added "--update-script" flag for specifying a command for running when new data piece is receviced.
by Anatoliy Lapitskiy 13 Mar '15

13 Mar '15

Sometimes it's worth to work on data ASAP after they updated and there is no time to wait for facters. Signed-off-by: Anatoliy Lapitskiy <anatoliy.lapitskiy(a)gmail.com>" --- alfred.h | 11 +++++++++++ main.c | 10 +++++++++- man/alfred.8 | 4 ++++ recv.c | 9 ++++++++- server.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 81 insertions(+), 2 deletions(-) diff --git a/alfred.h b/alfred.h index f26c80c..4eed67c 100644 --- a/alfred.h +++ b/alfred.h @@ -55,6 +55,11 @@ struct dataset { uint8_t local_data; }; +struct changed_data_type { + int data_type; + struct list_head list; +}; + struct transaction_packet { struct alfred_push_data_v0 *push; struct list_head list; @@ -118,6 +123,10 @@ struct globals { int unix_sock; const char *unix_path; + const char *update_script; + struct list_head changed_data_types; + int changed_data_type_count; + struct timespec if_check; struct hashtable_t *data_hash; @@ -134,6 +143,8 @@ extern const struct in6_addr in6addr_localmcast; /* server.c */ int alfred_server(struct globals *globals); int set_best_server(struct globals *globals); +void changed_data_type(struct globals *globals, int arg); + /* client.c */ int alfred_client_request_data(struct globals *globals); int alfred_client_set_data(struct globals *globals); diff --git a/main.c b/main.c index e9821be..6b1a5d1 100644 --- a/main.c +++ b/main.c @@ -61,6 +61,7 @@ static void alfred_usage(void) printf("\n"); printf(" -u, --unix-path [path] path to unix socket used for client-server\n"); printf(" communication (default: \""ALFRED_SOCK_PATH_DEFAULT"\")\n"); + printf(" -c, --update-script path to script to call on data change\n"); printf(" -v, --version print the version\n"); printf(" -h, --help this help\n"); printf("\n"); @@ -153,6 +154,7 @@ static struct globals *alfred_init(int argc, char *argv[]) {"modeswitch", required_argument, NULL, 'M'}, {"change-interface", required_argument, NULL, 'I'}, {"unix-path", required_argument, NULL, 'u'}, + {"update-script", required_argument, NULL, 'c'}, {"version", no_argument, NULL, 'v'}, {"verbose", no_argument, NULL, 'd'}, {NULL, 0, NULL, 0}, @@ -174,10 +176,13 @@ static struct globals *alfred_init(int argc, char *argv[]) globals->mesh_iface = "bat0"; globals->unix_path = ALFRED_SOCK_PATH_DEFAULT; globals->verbose = 0; + globals->update_script = NULL; + INIT_LIST_HEAD(&globals->changed_data_types); + globals->changed_data_type_count = 0; time_random_seed(); - while ((opt = getopt_long(argc, argv, "ms:r:hi:b:vV:M:I:u:d", long_options, + while ((opt = getopt_long(argc, argv, "ms:r:hi:b:vV:M:I:u:dc:", long_options, &opt_ind)) != -1) { switch (opt) { case 'r': @@ -237,6 +242,9 @@ static struct globals *alfred_init(int argc, char *argv[]) case 'd': globals->verbose++; break; + case 'c': + globals->update_script = optarg; + break; case 'v': printf("%s %s\n", argv[0], SOURCE_VERSION); printf("A.L.F.R.E.D. - Almighty Lightweight Remote Fact Exchange Daemon\n"); diff --git a/man/alfred.8 b/man/alfred.8 index a8050ab..872e200 100644 --- a/man/alfred.8 +++ b/man/alfred.8 @@ -114,6 +114,10 @@ still keeping redundancy (by having multiple masters). Obviously, at least one master must be present in the network to let any data exchange happen. Also having all nodes in master mode is possible (for maximum decentrality and overhead). +.TP +\fB\-c\fP, \fB\-\-update-script\fP \fIscriptname\fP +Specify path to script to call on data change. The script is called with +data-type list as arguments . .SH EXAMPLES Start an alfred server listening on bridge br0 (assuming that this bridge diff --git a/recv.c b/recv.c index e0252eb..0f6f50c 100644 --- a/recv.c +++ b/recv.c @@ -40,7 +40,7 @@ static int finish_alfred_push_data(struct globals *globals, struct ether_addr mac, struct alfred_push_data_v0 *push) { - int len, data_len; + int len, data_len, new_entry; struct alfred_data *data; struct dataset *dataset; uint8_t *pos; @@ -57,6 +57,7 @@ static int finish_alfred_push_data(struct globals *globals, if ((int)(data_len + sizeof(*data)) > len) break; + new_entry = 0; dataset = hash_find(globals->data_hash, data); if (!dataset) { dataset = malloc(sizeof(*dataset)); @@ -71,6 +72,7 @@ static int finish_alfred_push_data(struct globals *globals, free(dataset); goto err; } + new_entry = 1; } /* don't overwrite our own data */ if (dataset->data_source == SOURCE_LOCAL) @@ -78,6 +80,11 @@ static int finish_alfred_push_data(struct globals *globals, clock_gettime(CLOCK_MONOTONIC, &dataset->last_seen); + /* check that data was changed */ + if (new_entry || dataset->data.header.length != data_len || memcmp(dataset->buf, data->data, data_len) != 0) { + changed_data_type(globals, data->header.type); + } + /* free old buffer */ if (dataset->buf) { free(dataset->buf); diff --git a/server.c b/server.c index 1a3d876..f397de0 100644 --- a/server.c +++ b/server.c @@ -23,6 +23,7 @@ #include <inttypes.h> #include <net/ethernet.h> #include <net/if.h> +#include <signal.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> @@ -138,6 +139,24 @@ int set_best_server(struct globals *globals) return 0; } +void changed_data_type(struct globals *globals, int arg) +{ + if (!globals->update_script) + return; + + struct changed_data_type *data_type = NULL; + + list_for_each_entry(data_type, &globals->changed_data_types, list) { + if (data_type->data_type == arg) + return; + } + + data_type = malloc(sizeof(*data_type)); + data_type->data_type = arg; + list_add(&data_type->list, &globals->changed_data_types); + globals->changed_data_type_count++; +} + static int purge_data(struct globals *globals) { struct hash_it_t *hashit = NULL; @@ -153,6 +172,8 @@ static int purge_data(struct globals *globals) if (diff.tv_sec < ALFRED_DATA_TIMEOUT) continue; + changed_data_type(globals, dataset->data.header.type); + hash_remove_bucket(globals->data_hash, hashit); free(dataset->buf); free(dataset); @@ -345,6 +366,34 @@ int alfred_server(struct globals *globals) } purge_data(globals); check_if_sockets(globals); + + if (globals->update_script && !list_empty(&globals->changed_data_types)) { + /* call update script with list of datatypes_changed */ + char command[strlen(globals->update_script) + 7*globals->changed_data_type_count]; + char buf[7]; + strncpy(command, globals->update_script, sizeof(command)); + + struct changed_data_type *data_type, *is; + list_for_each_entry_safe(data_type, is, &globals->changed_data_types, list) { + /* append the datatype to command line */ + snprintf(buf, sizeof(buf), " %d", data_type->data_type); + strncat(command, buf, sizeof(command) - strlen(command)); + + /* clean the list */ + list_del(&data_type->list); + free(data_type); + } + + printf("executing: %s\n", command); + + signal(SIGCHLD, SIG_IGN); + int pid = fork(); + if (pid == 0) { + system(command); + exit(0); + } + globals->changed_data_type_count = 0; + } } netsock_close_all(globals); -- 2.1.4

3 3

[B.A.T.M.A.N.] [PATCH] alfred: "--update-script" flag for specifying a command for, running when new data piece is receviced.
by Anatoliy 12 Mar '15

12 Mar '15

Added "--update-script" flag for specifying a command for running when new data piece is receviced. Sometimes it's worth to work on data ASAP after they updated and there is no time to wait for facters. Signed-off-by: Anatoliy Lapitskiy <anatoliy.lapitskiy(a)gmail.com>" --- alfred.h | 11 +++++++++++ main.c | 10 +++++++++- man/alfred.8 | 4 ++++ recv.c | 9 ++++++++- server.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 81 insertions(+), 2 deletions(-) diff --git a/alfred.h b/alfred.h index f26c80c..4eed67c 100644 --- a/alfred.h +++ b/alfred.h @@ -55,6 +55,11 @@ struct dataset { uint8_t local_data; }; +struct changed_data_type { + int data_type; + struct list_head list; +}; + struct transaction_packet { struct alfred_push_data_v0 *push; struct list_head list; @@ -118,6 +123,10 @@ struct globals { int unix_sock; const char *unix_path; + const char *update_script; + struct list_head changed_data_types; + int changed_data_type_count; + struct timespec if_check; struct hashtable_t *data_hash; @@ -134,6 +143,8 @@ extern const struct in6_addr in6addr_localmcast; /* server.c */ int alfred_server(struct globals *globals); int set_best_server(struct globals *globals); +void changed_data_type(struct globals *globals, int arg); + /* client.c */ int alfred_client_request_data(struct globals *globals); int alfred_client_set_data(struct globals *globals); diff --git a/main.c b/main.c index e9821be..6b1a5d1 100644 --- a/main.c +++ b/main.c @@ -61,6 +61,7 @@ static void alfred_usage(void) printf("\n"); printf(" -u, --unix-path [path] path to unix socket used for client-server\n"); printf(" communication (default: \""ALFRED_SOCK_PATH_DEFAULT"\")\n"); + printf(" -c, --update-script path to script to call on data change\n"); printf(" -v, --version print the version\n"); printf(" -h, --help this help\n"); printf("\n"); @@ -153,6 +154,7 @@ static struct globals *alfred_init(int argc, char *argv[]) {"modeswitch", required_argument, NULL, 'M'}, {"change-interface", required_argument, NULL, 'I'}, {"unix-path", required_argument, NULL, 'u'}, + {"update-script", required_argument, NULL, 'c'}, {"version", no_argument, NULL, 'v'}, {"verbose", no_argument, NULL, 'd'}, {NULL, 0, NULL, 0}, @@ -174,10 +176,13 @@ static struct globals *alfred_init(int argc, char *argv[]) globals->mesh_iface = "bat0"; globals->unix_path = ALFRED_SOCK_PATH_DEFAULT; globals->verbose = 0; + globals->update_script = NULL; + INIT_LIST_HEAD(&globals->changed_data_types); + globals->changed_data_type_count = 0; time_random_seed(); - while ((opt = getopt_long(argc, argv, "ms:r:hi:b:vV:M:I:u:d", long_options, + while ((opt = getopt_long(argc, argv, "ms:r:hi:b:vV:M:I:u:dc:", long_options, &opt_ind)) != -1) { switch (opt) { case 'r': @@ -237,6 +242,9 @@ static struct globals *alfred_init(int argc, char *argv[]) case 'd': globals->verbose++; break; + case 'c': + globals->update_script = optarg; + break; case 'v': printf("%s %s\n", argv[0], SOURCE_VERSION); printf("A.L.F.R.E.D. - Almighty Lightweight Remote Fact Exchange Daemon\n"); diff --git a/man/alfred.8 b/man/alfred.8 index a8050ab..872e200 100644 --- a/man/alfred.8 +++ b/man/alfred.8 @@ -114,6 +114,10 @@ still keeping redundancy (by having multiple masters). Obviously, at least one master must be present in the network to let any data exchange happen. Also having all nodes in master mode is possible (for maximum decentrality and overhead). +.TP +\fB\-c\fP, \fB\-\-update-script\fP \fIscriptname\fP +Specify path to script to call on data change. The script is called with +data-type list as arguments . .SH EXAMPLES Start an alfred server listening on bridge br0 (assuming that this bridge diff --git a/recv.c b/recv.c index e0252eb..0f6f50c 100644 --- a/recv.c +++ b/recv.c @@ -40,7 +40,7 @@ static int finish_alfred_push_data(struct globals *globals, struct ether_addr mac, struct alfred_push_data_v0 *push) { - int len, data_len; + int len, data_len, new_entry; struct alfred_data *data; struct dataset *dataset; uint8_t *pos; @@ -57,6 +57,7 @@ static int finish_alfred_push_data(struct globals *globals, if ((int)(data_len + sizeof(*data)) > len) break; + new_entry = 0; dataset = hash_find(globals->data_hash, data); if (!dataset) { dataset = malloc(sizeof(*dataset)); @@ -71,6 +72,7 @@ static int finish_alfred_push_data(struct globals *globals, free(dataset); goto err; } + new_entry = 1; } /* don't overwrite our own data */ if (dataset->data_source == SOURCE_LOCAL) @@ -78,6 +80,11 @@ static int finish_alfred_push_data(struct globals *globals, clock_gettime(CLOCK_MONOTONIC, &dataset->last_seen); + /* check that data was changed */ + if (new_entry || dataset->data.header.length != data_len || memcmp(dataset->buf, data->data, data_len) != 0) { + changed_data_type(globals, data->header.type); + } + /* free old buffer */ if (dataset->buf) { free(dataset->buf); diff --git a/server.c b/server.c index 1a3d876..f397de0 100644 --- a/server.c +++ b/server.c @@ -23,6 +23,7 @@ #include <inttypes.h> #include <net/ethernet.h> #include <net/if.h> +#include <signal.h> #include <stddef.h> #include <stdint.h> #include <stdio.h> @@ -138,6 +139,24 @@ int set_best_server(struct globals *globals) return 0; } +void changed_data_type(struct globals *globals, int arg) +{ + if (!globals->update_script) + return; + + struct changed_data_type *data_type = NULL; + + list_for_each_entry(data_type, &globals->changed_data_types, list) { + if (data_type->data_type == arg) + return; + } + + data_type = malloc(sizeof(*data_type)); + data_type->data_type = arg; + list_add(&data_type->list, &globals->changed_data_types); + globals->changed_data_type_count++; +} + static int purge_data(struct globals *globals) { struct hash_it_t *hashit = NULL; @@ -153,6 +172,8 @@ static int purge_data(struct globals *globals) if (diff.tv_sec < ALFRED_DATA_TIMEOUT) continue; + changed_data_type(globals, dataset->data.header.type); + hash_remove_bucket(globals->data_hash, hashit); free(dataset->buf); free(dataset); @@ -345,6 +366,34 @@ int alfred_server(struct globals *globals) } purge_data(globals); check_if_sockets(globals); + + if (globals->update_script && !list_empty(&globals->changed_data_types)) { + /* call update script with list of datatypes_changed */ + char command[strlen(globals->update_script) + 7*globals->changed_data_type_count]; + char buf[7]; + strncpy(command, globals->update_script, sizeof(command)); + + struct changed_data_type *data_type, *is; + list_for_each_entry_safe(data_type, is, &globals->changed_data_types, list) { + /* append the datatype to command line */ + snprintf(buf, sizeof(buf), " %d", data_type->data_type); + strncat(command, buf, sizeof(command) - strlen(command)); + + /* clean the list */ + list_del(&data_type->list); + free(data_type); + } + + printf("executing: %s\n", command); + + signal(SIGCHLD, SIG_IGN); + int pid = fork(); + if (pid == 0) { + system(command); + exit(0); + } + globals->changed_data_type_count = 0; + } } netsock_close_all(globals); -- 2.1.4

2 1

[B.A.T.M.A.N.] [PATCH 1/2] alfred: Update version when adding data to dataset
by Sven Eckelmann 11 Mar '15

11 Mar '15

The dataset stores the source and the alfred_tlv of the send data next to the actual data buffer. The source and alfred_tlv::type was used to find an entry in the dataset hashtable when reading/updating the buffer. The alfred_tlv::length is always updated when the size of the associated buffer gets modified. But the alfred_tlv::version is only written when receiving the first data for a dataset. But this initial (maybe outdated) version is always propagated when a client asks over the unix socket or the dataset is exchanged between alfred servers. This has to also be updated when new data is added to the dataset to avoid clients to interpret the data using the wrong data format version. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- recv.c | 1 + unix_sock.c | 1 + 2 files changed, 2 insertions(+) diff --git a/recv.c b/recv.c index 34a16fc..e0252eb 100644 --- a/recv.c +++ b/recv.c @@ -91,6 +91,7 @@ static int finish_alfred_push_data(struct globals *globals, goto err; dataset->data.header.length = data_len; + dataset->data.header.version = data->header.version; memcpy(dataset->buf, data->data, data_len); /* if the sender is also the the source of the dataset, we diff --git a/unix_sock.c b/unix_sock.c index ae86956..0707252 100644 --- a/unix_sock.c +++ b/unix_sock.c @@ -151,6 +151,7 @@ static int unix_sock_add_data(struct globals *globals, goto err; dataset->data.header.length = data_len; + dataset->data.header.version = data->header.version; memcpy(dataset->buf, data->data, data_len); ret = 0; -- 2.1.4

2 4

[B.A.T.M.A.N.] [PATCH] alfred: Add explanation how to run alfred as non-root user
by Sven Eckelmann 11 Mar '15

11 Mar '15

Reported-by: MK <mailing.m1(a)kkk-web.de> Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- README | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/README b/README index 90a99de..205c156 100644 --- a/README +++ b/README @@ -256,6 +256,32 @@ To get JSON formatted output, use: See gpsd_json(5) for documentation of the tpv object. +Running alfred as non-root user +------------------------------- + +Alfred currently requires special capabilities and access rights to work +correctly. The user root is normally the only user having these +capabilities/rights on a standard Linux system. + +Operations requiring special capabilities: + + * bind to device + * creating the unix socket + * accessing the debugfs filesystem + +The first operation can still be executed when the admin grants the special +capability CAP_NET_RAW to anyone executing the alfred binary. The unix socket +can also be moved to a different directly which is accessible by the user by +adding the parameter '-u'. + + $ sudo setcap cap_net_raw+ep alfred + $ ./alfred -u alfred.sock -i eth0 + +The user running alfred must still be in a group which is allowed to access +/sys/kernel/debugfs to correctly choose best neighbors for communication. +It is possible (but not recommended) to disable the neighbor +selection/prioritization using the parameter '-b none'. + License ------- -- 2.1.4

3 4

[B.A.T.M.A.N.] [PATCH] alfred: Drop capabilities when not needed
by Sven Eckelmann 11 Mar '15

11 Mar '15

The alfred process only requires the capability to bind to a raw socket (CAP_NET_RAW). It is enough to mark this capability as permitted on program startup and mark it again as effective whenever a new netsock is initialized. All other capabilities can be dropped completely. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- Makefile | 24 ++++++++++++++++++ main.c | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- netsock.c | 44 +++++++++++++++++++++++++++++++++ 3 files changed, 151 insertions(+), 1 deletion(-) diff --git a/Makefile b/Makefile index 8e944c9..4e22d76 100644 --- a/Makefile +++ b/Makefile @@ -27,6 +27,9 @@ MANPAGE = man/alfred.8 CFLAGS += -pedantic -Wall -W -std=gnu99 -fno-strict-aliasing -MD -MP LDLIBS += -lrt +# B.A.T.M.A.N. debugging: +export CONFIG_ALFRED_CAPABILITIES=y + # disable verbose output ifneq ($(findstring $(MAKEFLAGS),s),s) ifndef V @@ -70,6 +73,27 @@ ifneq ($(CONFIG_ALFRED_GPSD),n) GPSD_INSTALL=gpsd-install endif +ifneq ($(CONFIG_ALFRED_CAPABILITIES),n) + ifeq ($(origin PKG_CONFIG), undefined) + PKG_CONFIG = pkg-config + ifeq ($(shell which $(PKG_CONFIG) 2>/dev/null),) + $(error $(PKG_CONFIG) not found) + endif + endif + + ifeq ($(origin LIBCAP_CFLAGS) $(origin LIBCAP_LDLIBS), undefined undefined) + LIBCAP_NAME ?= libcap + ifeq ($(shell $(PKG_CONFIG) --modversion $(LIBCAP_NAME) 2>/dev/null),) + $(error No $(LIBCAP_NAME) development libraries found!) + endif + LIBCAP_CFLAGS += $(shell $(PKG_CONFIG) --cflags $(LIBCAP_NAME)) + LIBCAP_LDLIBS += $(shell $(PKG_CONFIG) --libs $(LIBCAP_NAME)) + endif + CFLAGS += $(LIBCAP_CFLAGS) + CPPFLAGS += -DCONFIG_ALFRED_CAPABILITIES + LDLIBS += $(LIBCAP_LDLIBS) +endif + # default target all: $(BINARY_NAME) $(VIS_ALL) $(GPSD_ALL) diff --git a/main.c b/main.c index d298d65..982bd2a 100644 --- a/main.c +++ b/main.c @@ -24,6 +24,11 @@ #include <stdio.h> #include <stdlib.h> #include <string.h> +#ifdef CONFIG_ALFRED_CAPABILITIES +#include <sys/prctl.h> +#include <sys/capability.h> +#include <unistd.h> +#endif #include "alfred.h" #include "packet.h" #include "list.h" @@ -60,9 +65,82 @@ static void alfred_usage(void) printf("\n"); } +static int reduce_capabilities(void) +{ + int ret = 0; + +#ifdef CONFIG_ALFRED_CAPABILITIES + cap_t cap_cur; + cap_t cap_new; + cap_flag_value_t cap_flag; + cap_value_t cap_net_raw = CAP_NET_RAW; + + /* get current process capabilities */ + cap_cur = cap_get_proc(); + if (!cap_cur) { + perror("cap_get_proc"); + return -1; + } + + /* create new capabilities */ + cap_new = cap_init(); + if (!cap_new) { + perror("cap_init"); + cap_free(cap_new); + return -1; + } + + /* copy capability as non-effictive but permitted */ + cap_flag = CAP_CLEAR; + cap_get_flag(cap_cur, CAP_NET_RAW, CAP_PERMITTED, &cap_flag); + if (cap_flag != CAP_CLEAR) { + ret = cap_set_flag(cap_new, CAP_PERMITTED, 1, &cap_net_raw, + CAP_SET); + if (ret < 0) { + perror("cap_set_flag"); + goto out; + } + } + + /* set minimal capabilities field */ + ret = cap_set_proc(cap_new); + if (ret < 0) { + perror("cap_set_proc"); + goto out; + } + + /* don't drop capabilities with setuid */ + ret = prctl(PR_SET_KEEPCAPS, 1); + if (ret < 0) { + perror("prctl PR_SET_KEEPCAPS(1)"); + goto out; + } + + /* drop euid */ + ret = setuid(getuid()); + if (ret < 0) { + perror("setuid"); + goto out; + } + + /* drop capabilities with setuid */ + ret = prctl(PR_SET_KEEPCAPS, 0); + if (ret < 0) { + perror("prctl PR_SET_KEEPCAPS(0)"); + goto out; + } + +out: + cap_free(cap_new); + cap_free(cap_cur); +#endif + + return ret; +} + static struct globals *alfred_init(int argc, char *argv[]) { - int opt, opt_ind, i; + int opt, opt_ind, i, ret; struct globals *globals; struct option long_options[] = { {"set-data", required_argument, NULL, 's'}, @@ -78,6 +156,10 @@ static struct globals *alfred_init(int argc, char *argv[]) {NULL, 0, NULL, 0}, }; + ret = reduce_capabilities(); + if (ret < 0) + return NULL; + globals = &alfred_globals; memset(globals, 0, sizeof(*globals)); diff --git a/netsock.c b/netsock.c index cc2e9a5..592f3e3 100644 --- a/netsock.c +++ b/netsock.c @@ -34,6 +34,9 @@ #include <sys/types.h> #include <stdlib.h> #include <sys/select.h> +#ifdef CONFIG_ALFRED_CAPABILITIES +#include <sys/capability.h> +#endif #include "alfred.h" #include "batadv_query.h" #include "packet.h" @@ -165,6 +168,45 @@ int netsock_set_interfaces(struct globals *globals, char *interfaces) return 0; } +static int enable_raw_bind_capability(int enable) +{ + int ret = 0; + +#ifdef CONFIG_ALFRED_CAPABILITIES + cap_t cap_cur; + cap_flag_value_t cap_flag; + cap_value_t cap_net_raw = CAP_NET_RAW; + + if (enable) + cap_flag = CAP_SET; + else + cap_flag = CAP_CLEAR; + + cap_cur = cap_get_proc(); + if (!cap_cur) { + perror("cap_get_proc"); + return -1; + } + + ret = cap_set_flag(cap_cur, CAP_EFFECTIVE, 1, &cap_net_raw, cap_flag); + if (ret < 0) { + perror("cap_set_flag"); + goto out; + } + + ret = cap_set_proc(cap_cur); + if (ret < 0) { + perror("cap_set_proc"); + goto out; + } + +out: + cap_free(cap_cur); +#endif + + return ret; +} + static int netsock_open(struct interface *interface) { int sock; @@ -204,11 +246,13 @@ static int netsock_open(struct interface *interface) memcpy(&interface->hwaddr, &ifr.ifr_hwaddr.sa_data, 6); mac_to_ipv6(&interface->hwaddr, &interface->address); + enable_raw_bind_capability(1); if (setsockopt(sock, SOL_SOCKET, SO_BINDTODEVICE, interface->interface, strlen(interface->interface) + 1)) { perror("can't bind to device"); goto err; } + enable_raw_bind_capability(0); if (bind(sock, (struct sockaddr *)&sin6, sizeof(sin6)) < 0) { perror("can't bind"); -- 2.1.4

3 4

[B.A.T.M.A.N.] [PATCH] batman-adv: Remove unnecessary check for orig_ifinfo == NULL
by Sven Eckelmann 09 Mar '15

09 Mar '15

orig_ifinfo is dereferenced multiple times in batadv_iv_ogm_update_seqnos before the check for NULL is done. The function also exists at the beginning when orig_ifinfo would have been NULL. This makes the check at the end unnecessary and only confuses the reader/code analyzers. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- bat_iv_ogm.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 554e0e0..04bd220 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -1357,8 +1357,7 @@ batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr, out: spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); batadv_orig_node_free_ref(orig_node); - if (orig_ifinfo) - batadv_orig_ifinfo_free_ref(orig_ifinfo); + batadv_orig_ifinfo_free_ref(orig_ifinfo); return ret; } -- 2.1.4

2 1

[B.A.T.M.A.N.] [PATCHv4 1/2] batman-adv: Remove dynamically allocated hashtables
by Sven Eckelmann 06 Mar '15

06 Mar '15

It is unnecessary to allocate an extra memory region for hashtables and the corresponding locks. This brings the hashes used in batman-adv slightly in the direction of the common statically sized hash table implementation. More common hashtable functionality cannot be used batman-adv wide because the simple hashtable and rhashtable implementations don't provide bucket based locking. A sideeffect of this change is the initialization of each array of locks for each hashtable with a different lock_class. This allows to correct nesting of write access to two different hashtables without triggering a lockdep warning. This also fixes the problem of unprotected access to the pointer to the hashtables. These were dynamically allocated/freed and the pointers were stored in batadv_priv*. Access to these pointers were never protected by any lock and using them could always lead to problems when the batman-adv device was removed. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- v4: - updated commit message - renamed batadv_bucket to batadv_hashbucket - added BATADV_DECLARE_HASHTABLE to avoid all these "1u <<" - squashed RFCv3 2/3 with RFCv3 3/3 because 3/3 changed mostly all lines again which 2/3 modified and even deletes some of them again - Remove unused batadv_hash_delete - Added some missing function documentation blocks - replaced some 'size' in function parameters with 'hash_size' - Moved this patch to the first place to reduce number of modified lines in whole patchset --- Makefile.kbuild | 1 - bat_iv_ogm.c | 12 ++-- bridge_loop_avoidance.c | 129 +++++++++++++------------------------ distributed-arp-table.c | 48 ++++---------- hash.c | 76 ---------------------- hash.h | 108 +++++++++++++------------------ network-coding.c | 145 +++++++++++++++++++++-------------------- originator.c | 55 +++++----------- originator.h | 9 +-- translation-table.c | 168 ++++++++++++++++++++---------------------------- types.h | 27 +++++--- 11 files changed, 286 insertions(+), 492 deletions(-) delete mode 100644 hash.c diff --git a/Makefile.kbuild b/Makefile.kbuild index 6903703..6ee8b04 100644 --- a/Makefile.kbuild +++ b/Makefile.kbuild @@ -26,7 +26,6 @@ batman-adv-y += fragmentation.o batman-adv-y += gateway_client.o batman-adv-y += gateway_common.o batman-adv-y += hard-interface.o -batman-adv-y += hash.o batman-adv-y += icmp_socket.o batman-adv-y += main.o batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o diff --git a/bat_iv_ogm.c b/bat_iv_ogm.c index 554e0e0..64baed2 100644 --- a/bat_iv_ogm.c +++ b/bat_iv_ogm.c @@ -862,7 +862,7 @@ static void batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_head *head; struct batadv_orig_node *orig_node; unsigned long *word; @@ -871,8 +871,8 @@ batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface) uint8_t *w; int if_num; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { @@ -1799,7 +1799,7 @@ static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, struct batadv_hard_iface *if_outgoing) { struct batadv_neigh_node *neigh_node; - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; int last_seen_msecs, last_seen_secs; struct batadv_orig_node *orig_node; struct batadv_neigh_ifinfo *n_ifinfo; @@ -1812,8 +1812,8 @@ static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv, "Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE, "Nexthop", "outgoingIF", "Potential nexthops"); - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { diff --git a/bridge_loop_avoidance.c b/bridge_loop_avoidance.c index 6927589..496f154 100644 --- a/bridge_loop_avoidance.c +++ b/bridge_loop_avoidance.c @@ -133,17 +133,14 @@ static struct batadv_bla_claim *batadv_claim_hash_find(struct batadv_priv *bat_priv, struct batadv_bla_claim *data) { - struct batadv_hashtable *hash = bat_priv->bla.claim_hash; + struct batadv_hashbucket *hash = bat_priv->bla.claim_hash; struct hlist_head *head; struct batadv_bla_claim *claim; struct batadv_bla_claim *claim_tmp = NULL; int index; - if (!hash) - return NULL; - - index = batadv_choose_claim(data, hash->size); - head = &hash->table[index]; + index = batadv_choose_claim(data, ARRAY_SIZE(bat_priv->bla.claim_hash)); + head = &hash[index].head; rcu_read_lock(); hlist_for_each_entry_rcu(claim, head, hash_entry) { @@ -173,20 +170,18 @@ static struct batadv_bla_backbone_gw * batadv_backbone_hash_find(struct batadv_priv *bat_priv, uint8_t *addr, unsigned short vid) { - struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; + struct batadv_hashbucket *hash = bat_priv->bla.backbone_hash; struct hlist_head *head; struct batadv_bla_backbone_gw search_entry, *backbone_gw; struct batadv_bla_backbone_gw *backbone_gw_tmp = NULL; int index; - - if (!hash) - return NULL; + uint32_t hash_size = ARRAY_SIZE(bat_priv->bla.backbone_hash); ether_addr_copy(search_entry.orig, addr); search_entry.vid = vid; - index = batadv_choose_backbone_gw(&search_entry, hash->size); - head = &hash->table[index]; + index = batadv_choose_backbone_gw(&search_entry, hash_size); + head = &hash[index].head; rcu_read_lock(); hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { @@ -209,20 +204,19 @@ batadv_backbone_hash_find(struct batadv_priv *bat_priv, static void batadv_bla_del_backbone_claims(struct batadv_bla_backbone_gw *backbone_gw) { - struct batadv_hashtable *hash; + struct batadv_priv *bat_priv = backbone_gw->bat_priv; + struct batadv_hashbucket *hash; struct hlist_node *node_tmp; struct hlist_head *head; struct batadv_bla_claim *claim; int i; spinlock_t *list_lock; /* protects write access to the hash lists */ - hash = backbone_gw->bat_priv->bla.claim_hash; - if (!hash) - return; + hash = bat_priv->bla.claim_hash; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.claim_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(claim, node_tmp, @@ -457,7 +451,7 @@ static void batadv_bla_answer_request(struct batadv_priv *bat_priv, unsigned short vid) { struct hlist_head *head; - struct batadv_hashtable *hash; + struct batadv_hashbucket *hash; struct batadv_bla_claim *claim; struct batadv_bla_backbone_gw *backbone_gw; int i; @@ -472,8 +466,8 @@ static void batadv_bla_answer_request(struct batadv_priv *bat_priv, return; hash = bat_priv->bla.claim_hash; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.claim_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(claim, head, hash_entry) { @@ -986,17 +980,15 @@ static void batadv_bla_purge_backbone_gw(struct batadv_priv *bat_priv, int now) struct batadv_bla_backbone_gw *backbone_gw; struct hlist_node *node_tmp; struct hlist_head *head; - struct batadv_hashtable *hash; + struct batadv_hashbucket *hash; spinlock_t *list_lock; /* protects write access to the hash lists */ int i; hash = bat_priv->bla.backbone_hash; - if (!hash) - return; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.backbone_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(backbone_gw, node_tmp, @@ -1040,15 +1032,13 @@ static void batadv_bla_purge_claims(struct batadv_priv *bat_priv, { struct batadv_bla_claim *claim; struct hlist_head *head; - struct batadv_hashtable *hash; + struct batadv_hashbucket *hash; int i; hash = bat_priv->bla.claim_hash; - if (!hash) - return; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.claim_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(claim, head, hash_entry) { @@ -1088,7 +1078,7 @@ void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, { struct batadv_bla_backbone_gw *backbone_gw; struct hlist_head *head; - struct batadv_hashtable *hash; + struct batadv_hashbucket *hash; __be16 group; int i; @@ -1107,11 +1097,9 @@ void batadv_bla_update_orig_address(struct batadv_priv *bat_priv, } hash = bat_priv->bla.backbone_hash; - if (!hash) - return; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.backbone_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { @@ -1142,7 +1130,7 @@ static void batadv_bla_periodic_work(struct work_struct *work) struct batadv_priv_bla *priv_bla; struct hlist_head *head; struct batadv_bla_backbone_gw *backbone_gw; - struct batadv_hashtable *hash; + struct batadv_hashbucket *hash; struct batadv_hard_iface *primary_if; int i; @@ -1160,11 +1148,9 @@ static void batadv_bla_periodic_work(struct work_struct *work) goto out; hash = bat_priv->bla.backbone_hash; - if (!hash) - goto out; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.backbone_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { @@ -1204,14 +1190,6 @@ out: msecs_to_jiffies(BATADV_BLA_PERIOD_LENGTH)); } -/* The hash for claim and backbone hash receive the same key because they - * are getting initialized by hash_new with the same key. Reinitializing - * them with to different keys to allow nested locking without generating - * lockdep warnings - */ -static struct lock_class_key batadv_claim_hash_lock_class_key; -static struct lock_class_key batadv_backbone_hash_lock_class_key; - /* initialize all bla structures */ int batadv_bla_init(struct batadv_priv *bat_priv) { @@ -1243,19 +1221,8 @@ int batadv_bla_init(struct batadv_priv *bat_priv) bat_priv->bla.bcast_duplist[i].entrytime = entrytime; bat_priv->bla.bcast_duplist_curr = 0; - if (bat_priv->bla.claim_hash) - return 0; - - bat_priv->bla.claim_hash = batadv_hash_new(128); - bat_priv->bla.backbone_hash = batadv_hash_new(32); - - if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) - return -ENOMEM; - - batadv_hash_set_lock_class(bat_priv->bla.claim_hash, - &batadv_claim_hash_lock_class_key); - batadv_hash_set_lock_class(bat_priv->bla.backbone_hash, - &batadv_backbone_hash_lock_class_key); + batadv_hash_init(bat_priv->bla.claim_hash); + batadv_hash_init(bat_priv->bla.backbone_hash); batadv_dbg(BATADV_DBG_BLA, bat_priv, "bla hashes initialized\n"); @@ -1349,7 +1316,7 @@ out: bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig, unsigned short vid) { - struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; + struct batadv_hashbucket *hash = bat_priv->bla.backbone_hash; struct hlist_head *head; struct batadv_bla_backbone_gw *backbone_gw; int i; @@ -1357,11 +1324,8 @@ bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, uint8_t *orig, if (!atomic_read(&bat_priv->bridge_loop_avoidance)) return false; - if (!hash) - return false; - - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.backbone_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { @@ -1420,16 +1384,9 @@ void batadv_bla_free(struct batadv_priv *bat_priv) cancel_delayed_work_sync(&bat_priv->bla.work); primary_if = batadv_primary_if_get_selected(bat_priv); - if (bat_priv->bla.claim_hash) { - batadv_bla_purge_claims(bat_priv, primary_if, 1); - batadv_hash_destroy(bat_priv->bla.claim_hash); - bat_priv->bla.claim_hash = NULL; - } - if (bat_priv->bla.backbone_hash) { - batadv_bla_purge_backbone_gw(bat_priv, 1); - batadv_hash_destroy(bat_priv->bla.backbone_hash); - bat_priv->bla.backbone_hash = NULL; - } + batadv_bla_purge_claims(bat_priv, primary_if, 1); + batadv_bla_purge_backbone_gw(bat_priv, 1); + if (primary_if) batadv_hardif_free_ref(primary_if); } @@ -1621,7 +1578,7 @@ int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); - struct batadv_hashtable *hash = bat_priv->bla.claim_hash; + struct batadv_hashbucket *hash = bat_priv->bla.claim_hash; struct batadv_bla_claim *claim; struct batadv_hard_iface *primary_if; struct hlist_head *head; @@ -1640,8 +1597,8 @@ int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset) ntohs(bat_priv->bla.claim_dest.group)); seq_printf(seq, " %-17s %-5s %-17s [o] (%-6s)\n", "Client", "VID", "Originator", "CRC"); - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.claim_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(claim, head, hash_entry) { @@ -1665,7 +1622,7 @@ int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); - struct batadv_hashtable *hash = bat_priv->bla.backbone_hash; + struct batadv_hashbucket *hash = bat_priv->bla.backbone_hash; struct batadv_bla_backbone_gw *backbone_gw; struct batadv_hard_iface *primary_if; struct hlist_head *head; @@ -1685,8 +1642,8 @@ int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq, void *offset) ntohs(bat_priv->bla.claim_dest.group)); seq_printf(seq, " %-17s %-5s %-9s (%-6s)\n", "Originator", "VID", "last seen", "CRC"); - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->bla.backbone_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(backbone_gw, head, hash_entry) { diff --git a/distributed-arp-table.c b/distributed-arp-table.c index 107ad62..181c982 100644 --- a/distributed-arp-table.c +++ b/distributed-arp-table.c @@ -85,12 +85,9 @@ static void __batadv_dat_purge(struct batadv_priv *bat_priv, struct hlist_head *head; uint32_t i; - if (!bat_priv->dat.hash) - return; - - for (i = 0; i < bat_priv->dat.hash->size; i++) { - head = &bat_priv->dat.hash->table[i]; - list_lock = &bat_priv->dat.hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->dat.hash); i++) { + head = &bat_priv->dat.hash[i].head; + list_lock = &bat_priv->dat.hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(dat_entry, node_tmp, head, @@ -245,17 +242,14 @@ batadv_dat_entry_hash_find(struct batadv_priv *bat_priv, __be32 ip, { struct hlist_head *head; struct batadv_dat_entry to_find, *dat_entry, *dat_entry_tmp = NULL; - struct batadv_hashtable *hash = bat_priv->dat.hash; + struct batadv_hashbucket *hash = bat_priv->dat.hash; uint32_t index; - if (!hash) - return NULL; - to_find.ip = ip; to_find.vid = vid; - index = batadv_hash_dat(&to_find, hash->size); - head = &hash->table[index]; + index = batadv_hash_dat(&to_find, ARRAY_SIZE(bat_priv->dat.hash)); + head = &hash[index].head; rcu_read_lock(); hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { @@ -480,7 +474,7 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, { batadv_dat_addr_t max = 0, tmp_max = 0; struct batadv_orig_node *orig_node, *max_orig_node = NULL; - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_head *head; int i; @@ -492,8 +486,8 @@ static void batadv_choose_next_candidate(struct batadv_priv *bat_priv, /* iterate over the originator list and find the node with the closest * dat_address which has not been selected yet */ - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { @@ -547,9 +541,6 @@ batadv_dat_select_candidates(struct batadv_priv *bat_priv, __be32 ip_dst) batadv_dat_addr_t last_max = BATADV_DAT_ADDR_MAX, ip_key; struct batadv_dat_candidate *res; - if (!bat_priv->orig_hash) - return NULL; - res = kmalloc_array(BATADV_DAT_CANDIDATES_NUM, sizeof(*res), GFP_ATOMIC); if (!res) @@ -706,14 +697,7 @@ static void batadv_dat_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, */ static void batadv_dat_hash_free(struct batadv_priv *bat_priv) { - if (!bat_priv->dat.hash) - return; - __batadv_dat_purge(bat_priv, NULL); - - batadv_hash_destroy(bat_priv->dat.hash); - - bat_priv->dat.hash = NULL; } /** @@ -722,13 +706,7 @@ static void batadv_dat_hash_free(struct batadv_priv *bat_priv) */ int batadv_dat_init(struct batadv_priv *bat_priv) { - if (bat_priv->dat.hash) - return 0; - - bat_priv->dat.hash = batadv_hash_new(1024); - - if (!bat_priv->dat.hash) - return -ENOMEM; + batadv_hash_init(bat_priv->dat.hash); batadv_dat_start_timer(bat_priv); @@ -762,7 +740,7 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); - struct batadv_hashtable *hash = bat_priv->dat.hash; + struct batadv_hashbucket *hash = bat_priv->dat.hash; struct batadv_dat_entry *dat_entry; struct batadv_hard_iface *primary_if; struct hlist_head *head; @@ -778,8 +756,8 @@ int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset) seq_printf(seq, " %-7s %-9s %4s %11s\n", "IPv4", "MAC", "VID", "last-seen"); - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->dat.hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(dat_entry, head, hash_entry) { diff --git a/hash.c b/hash.c deleted file mode 100644 index 7c1c630..0000000 --- a/hash.c +++ /dev/null @@ -1,76 +0,0 @@ -/* Copyright (C) 2006-2014 B.A.T.M.A.N. contributors: - * - * Simon Wunderlich, Marek Lindner - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of version 2 of the GNU General Public - * License as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, see <http://www.gnu.org/licenses/>. - */ - -#include "main.h" -#include "hash.h" - -/* clears the hash */ -static void batadv_hash_init(struct batadv_hashtable *hash) -{ - uint32_t i; - - for (i = 0; i < hash->size; i++) { - INIT_HLIST_HEAD(&hash->table[i]); - spin_lock_init(&hash->list_locks[i]); - } -} - -/* free only the hashtable and the hash itself. */ -void batadv_hash_destroy(struct batadv_hashtable *hash) -{ - kfree(hash->list_locks); - kfree(hash->table); - kfree(hash); -} - -/* allocates and clears the hash */ -struct batadv_hashtable *batadv_hash_new(uint32_t size) -{ - struct batadv_hashtable *hash; - - hash = kmalloc(sizeof(*hash), GFP_ATOMIC); - if (!hash) - return NULL; - - hash->table = kmalloc_array(size, sizeof(*hash->table), GFP_ATOMIC); - if (!hash->table) - goto free_hash; - - hash->list_locks = kmalloc_array(size, sizeof(*hash->list_locks), - GFP_ATOMIC); - if (!hash->list_locks) - goto free_table; - - hash->size = size; - batadv_hash_init(hash); - return hash; - -free_table: - kfree(hash->table); -free_hash: - kfree(hash); - return NULL; -} - -void batadv_hash_set_lock_class(struct batadv_hashtable *hash, - struct lock_class_key *key) -{ - uint32_t i; - - for (i = 0; i < hash->size; i++) - lockdep_set_class(&hash->list_locks[i], key); -} diff --git a/hash.h b/hash.h index a1d0980..e1d62c5 100644 --- a/hash.h +++ b/hash.h @@ -20,6 +20,15 @@ #include <linux/list.h> +#define batadv_hash_init(hashtable) \ + do { \ + uint32_t _it; \ + for (_it = 0; _it < ARRAY_SIZE(hashtable); _it++) { \ + INIT_HLIST_HEAD(&hashtable[_it].head); \ + spin_lock_init(&hashtable[_it].lock); \ + } \ + } while (0) + /* callback to a compare function. should compare 2 element datas for their * keys, return 0 if same and not 0 if not same */ @@ -33,52 +42,6 @@ typedef int (*batadv_hashdata_compare_cb)(const struct hlist_node *, typedef uint32_t (*batadv_hashdata_choose_cb)(const void *, uint32_t); typedef void (*batadv_hashdata_free_cb)(struct hlist_node *, void *); -struct batadv_hashtable { - struct hlist_head *table; /* the hashtable itself with the buckets */ - spinlock_t *list_locks; /* spinlock for each hash list entry */ - uint32_t size; /* size of hashtable */ -}; - -/* allocates and clears the hash */ -struct batadv_hashtable *batadv_hash_new(uint32_t size); - -/* set class key for all locks */ -void batadv_hash_set_lock_class(struct batadv_hashtable *hash, - struct lock_class_key *key); - -/* free only the hashtable and the hash itself. */ -void batadv_hash_destroy(struct batadv_hashtable *hash); - -/* remove the hash structure. if hashdata_free_cb != NULL, this function will be - * called to remove the elements inside of the hash. if you don't remove the - * elements, memory might be leaked. - */ -static inline void batadv_hash_delete(struct batadv_hashtable *hash, - batadv_hashdata_free_cb free_cb, - void *arg) -{ - struct hlist_head *head; - struct hlist_node *node, *node_tmp; - spinlock_t *list_lock; /* spinlock to protect write access */ - uint32_t i; - - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; - - spin_lock_bh(list_lock); - hlist_for_each_safe(node, node_tmp, head) { - hlist_del_rcu(node); - - if (free_cb) - free_cb(node, arg); - } - spin_unlock_bh(list_lock); - } - - batadv_hash_destroy(hash); -} - /** * batadv_hash_add - adds data to the hashtable * @hash: storage hash table @@ -90,11 +53,28 @@ static inline void batadv_hash_delete(struct batadv_hashtable *hash, * Returns 0 on success, 1 if the element already is in the hash * and -1 on error. */ -static inline int batadv_hash_add(struct batadv_hashtable *hash, - batadv_hashdata_compare_cb compare, - batadv_hashdata_choose_cb choose, - const void *data, - struct hlist_node *data_node) +#define batadv_hash_add(hash, compare, choose, data, data_node) \ + _batadv_hash_add(hash, ARRAY_SIZE(hash), compare, choose, data, \ + data_node) + +/** + * _batadv_hash_add - adds data to the hashtable of a given size + * @hash: storage hash table + * @hash_size: number of buckets in the hashtable @hash + * @compare: callback to determine if 2 hash elements are identical + * @choose: callback calculating the hash index + * @data: data passed to the aforementioned callbacks as argument + * @data_node: to be added element + * + * Returns 0 on success, 1 if the element already is in the hash + * and -1 on error. + */ +static inline int _batadv_hash_add(struct batadv_hashbucket *hash, + uint32_t hash_size, + batadv_hashdata_compare_cb compare, + batadv_hashdata_choose_cb choose, + const void *data, + struct hlist_node *data_node) { uint32_t index; int ret = -1; @@ -105,9 +85,9 @@ static inline int batadv_hash_add(struct batadv_hashtable *hash, if (!hash) goto out; - index = choose(data, hash->size); - head = &hash->table[index]; - list_lock = &hash->list_locks[index]; + index = choose(data, hash_size); + head = &hash[index].head; + list_lock = &hash[index].lock; spin_lock_bh(list_lock); @@ -135,20 +115,24 @@ out: * structure you use with just the key filled, we just need the key for * comparing. */ -static inline void *batadv_hash_remove(struct batadv_hashtable *hash, - batadv_hashdata_compare_cb compare, - batadv_hashdata_choose_cb choose, - void *data) +#define batadv_hash_remove(hash, compare, choose, data) \ + _batadv_hash_remove(hash, ARRAY_SIZE(hash), compare, choose, data) + +static inline void *_batadv_hash_remove(struct batadv_hashbucket *hash, + uint32_t hash_size, + batadv_hashdata_compare_cb compare, + batadv_hashdata_choose_cb choose, + void *data) { uint32_t index; struct hlist_node *node; struct hlist_head *head; void *data_save = NULL; - index = choose(data, hash->size); - head = &hash->table[index]; + index = choose(data, hash_size); + head = &hash[index].head; - spin_lock_bh(&hash->list_locks[index]); + spin_lock_bh(&hash[index].lock); hlist_for_each(node, head) { if (!compare(node, data)) continue; @@ -157,7 +141,7 @@ static inline void *batadv_hash_remove(struct batadv_hashtable *hash, hlist_del_rcu(node); break; } - spin_unlock_bh(&hash->list_locks[index]); + spin_unlock_bh(&hash[index].lock); return data_save; } diff --git a/network-coding.c b/network-coding.c index d128c3b..c9254f8 100644 --- a/network-coding.c +++ b/network-coding.c @@ -25,9 +25,6 @@ #include "hard-interface.h" #include "routing.h" -static struct lock_class_key batadv_nc_coding_hash_lock_class_key; -static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; - static void batadv_nc_worker(struct work_struct *work); static int batadv_nc_recv_coded_packet(struct sk_buff *skb, struct batadv_hard_iface *recv_if); @@ -119,22 +116,8 @@ int batadv_nc_mesh_init(struct batadv_priv *bat_priv) bat_priv->nc.timestamp_fwd_flush = jiffies; bat_priv->nc.timestamp_sniffed_purge = jiffies; - if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) - return 0; - - bat_priv->nc.coding_hash = batadv_hash_new(128); - if (!bat_priv->nc.coding_hash) - goto err; - - batadv_hash_set_lock_class(bat_priv->nc.coding_hash, - &batadv_nc_coding_hash_lock_class_key); - - bat_priv->nc.decoding_hash = batadv_hash_new(128); - if (!bat_priv->nc.decoding_hash) - goto err; - - batadv_hash_set_lock_class(bat_priv->nc.decoding_hash, - &batadv_nc_decoding_hash_lock_class_key); + batadv_hash_init(bat_priv->nc.coding_hash); + batadv_hash_init(bat_priv->nc.decoding_hash); INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker); batadv_nc_start_timer(bat_priv); @@ -144,9 +127,6 @@ int batadv_nc_mesh_init(struct batadv_priv *bat_priv) BATADV_TVLV_HANDLER_OGM_CIFNOTFND); batadv_nc_tvlv_container_update(bat_priv); return 0; - -err: - return -ENOMEM; } /** @@ -349,17 +329,14 @@ void batadv_nc_purge_orig(struct batadv_priv *bat_priv, */ static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) { - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_head *head; struct batadv_orig_node *orig_node; uint32_t i; - if (!hash) - return; - /* For each orig_node */ - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) @@ -379,10 +356,25 @@ static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) * a boolean value: true is the entry has to be deleted, false * otherwise */ -static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, - struct batadv_hashtable *hash, - bool (*to_purge)(struct batadv_priv *, - struct batadv_nc_path *)) +#define batadv_nc_purge_paths(bat_priv, hash, to_purge) \ + _batadv_nc_purge_paths(bat_priv, hash, ARRAY_SIZE(hash), to_purge) + +/** + * _batadv_nc_purge_paths - traverse all nc paths part of the hash and remove + * unused ones + * @bat_priv: the bat priv with all the soft interface information + * @hash: hash table containing the nc paths to check + * @hash_size: number of buckets in the hashtable + * @to_purge: function in charge to decide whether an entry has to be purged or + * not. This function takes the nc node as argument and has to return + * a boolean value: true is the entry has to be deleted, false + * otherwise + */ +static void _batadv_nc_purge_paths(struct batadv_priv *bat_priv, + struct batadv_hashbucket *hash, + uint32_t hash_size, + bool (*to_purge)(struct batadv_priv *, + struct batadv_nc_path *)) { struct hlist_head *head; struct hlist_node *node_tmp; @@ -390,9 +382,9 @@ static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, spinlock_t *lock; /* Protects lists in hash */ uint32_t i; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - lock = &hash->list_locks[i]; + for (i = 0; i < hash_size; i++) { + head = &hash[i].head; + lock = &hash[i].lock; /* For each nc_path in this bin */ spin_lock_bh(lock); @@ -490,23 +482,21 @@ static int batadv_nc_hash_compare(const struct hlist_node *node, /** * batadv_nc_hash_find - search for an existing nc path and return it * @hash: hash table containing the nc path + * @hash_size: number of buckets in the hashtable * @data: search key * * Returns the nc_path if found, NULL otherwise. */ static struct batadv_nc_path * -batadv_nc_hash_find(struct batadv_hashtable *hash, +batadv_nc_hash_find(struct batadv_hashbucket *hash, uint32_t hash_size, void *data) { struct hlist_head *head; struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; int index; - if (!hash) - return NULL; - - index = batadv_nc_hash_choose(data, hash->size); - head = &hash->table[index]; + index = batadv_nc_hash_choose(data, hash_size); + head = &hash[index].head; rcu_read_lock(); hlist_for_each_entry_rcu(nc_path, head, hash_entry) { @@ -619,12 +609,26 @@ static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, * to encourage this function to proceed with the next packet. * Otherwise the rest of the current queue is skipped. */ +#define batadv_nc_process_nc_paths(bat_priv, hash, process_fn) \ + _batadv_nc_process_nc_paths(bat_priv, hash, ARRAY_SIZE(hash), \ + process_fn) + +/** + * _batadv_nc_process_nc_paths - traverse given nc packet pool and free timed + * out nc packets + * @bat_priv: the bat priv with all the soft interface information + * @hash: to be processed hash table + * @hash_size: number of buckets in the hashtable + * @process_fn: Function called to process given nc packet. Should return true + * to encourage this function to proceed with the next packet. + * Otherwise the rest of the current queue is skipped. + */ static void -batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, - struct batadv_hashtable *hash, - bool (*process_fn)(struct batadv_priv *, - struct batadv_nc_path *, - struct batadv_nc_packet *)) +_batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, + struct batadv_hashbucket *hash, uint32_t hash_size, + bool (*process_fn)(struct batadv_priv *, + struct batadv_nc_path *, + struct batadv_nc_packet *)) { struct hlist_head *head; struct batadv_nc_packet *nc_packet, *nc_packet_tmp; @@ -632,12 +636,9 @@ batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, bool ret; int i; - if (!hash) - return; - /* Loop hash table bins */ - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < hash_size; i++) { + head = &hash[i].head; /* Loop coding paths */ rcu_read_lock(); @@ -900,6 +901,7 @@ out: * batadv_nc_get_path - get existing nc_path or allocate a new one * @bat_priv: the bat priv with all the soft interface information * @hash: hash table containing the nc path + * @hash_size: number of buckets in the hashtable * @src: ethernet source address - first half of the nc path search key * @dst: ethernet destination address - second half of the nc path search key * @@ -907,7 +909,8 @@ out: * on error. */ static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, - struct batadv_hashtable *hash, + struct batadv_hashbucket *hash, + uint32_t hash_size, uint8_t *src, uint8_t *dst) { @@ -917,7 +920,7 @@ static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, batadv_nc_hash_key_gen(&nc_path_key, src, dst); /* Search for existing nc_path */ - nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); + nc_path = batadv_nc_hash_find(hash, hash_size, (void *)&nc_path_key); if (nc_path) { /* Set timestamp to delay removal of nc_path */ @@ -944,9 +947,9 @@ static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, nc_path->next_hop); /* Add nc_path to hash table */ - hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, - batadv_nc_hash_choose, &nc_path_key, - &nc_path->hash_entry); + hash_added = _batadv_hash_add(hash, hash_size, batadv_nc_hash_compare, + batadv_nc_hash_choose, &nc_path_key, + &nc_path->hash_entry); if (hash_added < 0) { kfree(nc_path); @@ -1230,20 +1233,18 @@ batadv_nc_path_search(struct batadv_priv *bat_priv, struct batadv_nc_path *nc_path, nc_path_key; struct batadv_nc_packet *nc_packet_out = NULL; struct batadv_nc_packet *nc_packet, *nc_packet_tmp; - struct batadv_hashtable *hash = bat_priv->nc.coding_hash; + struct batadv_hashbucket *hash = bat_priv->nc.coding_hash; int idx; - if (!hash) - return NULL; - /* Create almost path key */ batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, out_nc_node->addr); - idx = batadv_nc_hash_choose(&nc_path_key, hash->size); + idx = batadv_nc_hash_choose(&nc_path_key, + ARRAY_SIZE(bat_priv->nc.coding_hash)); /* Check for coding opportunities in this nc_path */ rcu_read_lock(); - hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { + hlist_for_each_entry_rcu(nc_path, &hash[idx].head, hash_entry) { if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) continue; @@ -1487,6 +1488,7 @@ bool batadv_nc_skb_forward(struct sk_buff *skb, /* Find or create a nc_path for this src-dst pair */ nc_path = batadv_nc_get_path(bat_priv, bat_priv->nc.coding_hash, + ARRAY_SIZE(bat_priv->nc.coding_hash), ethhdr->h_source, neigh_node->addr); @@ -1536,6 +1538,7 @@ void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, /* Find existing nc_path or create a new */ nc_path = batadv_nc_get_path(bat_priv, bat_priv->nc.decoding_hash, + ARRAY_SIZE(bat_priv->nc.decoding_hash), ethhdr->h_source, ethhdr->h_dest); @@ -1697,16 +1700,13 @@ batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, struct ethhdr *ethhdr, struct batadv_coded_packet *coded) { - struct batadv_hashtable *hash = bat_priv->nc.decoding_hash; + struct batadv_hashbucket *hash = bat_priv->nc.decoding_hash; struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL; struct batadv_nc_path *nc_path, nc_path_key; uint8_t *dest, *source; __be32 packet_id; int index; - if (!hash) - return NULL; - /* Select the correct packet id based on the location of our mac-addr */ dest = ethhdr->h_source; if (!batadv_is_my_mac(bat_priv, coded->second_dest)) { @@ -1718,11 +1718,12 @@ batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, } batadv_nc_hash_key_gen(&nc_path_key, source, dest); - index = batadv_nc_hash_choose(&nc_path_key, hash->size); + index = batadv_nc_hash_choose(&nc_path_key, + ARRAY_SIZE(bat_priv->nc.decoding_hash)); /* Search for matching coding path */ rcu_read_lock(); - hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) { + hlist_for_each_entry_rcu(nc_path, &hash[index].head, hash_entry) { /* Find matching nc_packet */ spin_lock_bh(&nc_path->packet_list_lock); list_for_each_entry(tmp_nc_packet, @@ -1828,9 +1829,7 @@ void batadv_nc_mesh_free(struct batadv_priv *bat_priv) cancel_delayed_work_sync(&bat_priv->nc.work); batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); - batadv_hash_destroy(bat_priv->nc.coding_hash); batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); - batadv_hash_destroy(bat_priv->nc.decoding_hash); } /** @@ -1842,7 +1841,7 @@ int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct batadv_hard_iface *primary_if; struct hlist_head *head; struct batadv_orig_node *orig_node; @@ -1854,8 +1853,8 @@ int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) goto out; /* Traverse list of originators */ - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; /* For each orig_node in this bin */ rcu_read_lock(); diff --git a/originator.c b/originator.c index 9e04e60..058fb4f 100644 --- a/originator.c +++ b/originator.c @@ -29,9 +29,6 @@ #include "fragmentation.h" #include "multicast.h" -/* hash class keys */ -static struct lock_class_key batadv_orig_hash_lock_class_key; - static void batadv_purge_orig(struct work_struct *work); /* returns 1 if they are the same originator */ @@ -127,16 +124,7 @@ void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan) int batadv_originator_init(struct batadv_priv *bat_priv) { - if (bat_priv->orig_hash) - return 0; - - bat_priv->orig_hash = batadv_hash_new(1024); - - if (!bat_priv->orig_hash) - goto err; - - batadv_hash_set_lock_class(bat_priv->orig_hash, - &batadv_orig_hash_lock_class_key); + batadv_hash_init(bat_priv->orig_hash); INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig); queue_delayed_work(batadv_event_workqueue, @@ -144,9 +132,6 @@ int batadv_originator_init(struct batadv_priv *bat_priv) msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); return 0; - -err: - return -ENOMEM; } /** @@ -607,23 +592,18 @@ void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node) void batadv_originator_free(struct batadv_priv *bat_priv) { - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_node *node_tmp; struct hlist_head *head; spinlock_t *list_lock; /* spinlock to protect write access */ struct batadv_orig_node *orig_node; uint32_t i; - if (!hash) - return; - cancel_delayed_work_sync(&bat_priv->orig_work); - bat_priv->orig_hash = NULL; - - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(orig_node, node_tmp, @@ -633,8 +613,6 @@ void batadv_originator_free(struct batadv_priv *bat_priv) } spin_unlock_bh(list_lock); } - - batadv_hash_destroy(hash); } /** @@ -959,20 +937,17 @@ static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, static void _batadv_purge_orig(struct batadv_priv *bat_priv) { - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_node *node_tmp; struct hlist_head *head; spinlock_t *list_lock; /* spinlock to protect write access */ struct batadv_orig_node *orig_node; uint32_t i; - if (!hash) - return; - /* for all origins... */ - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(orig_node, node_tmp, @@ -1095,7 +1070,7 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_head *head; struct batadv_orig_node *orig_node; uint32_t i; @@ -1104,8 +1079,8 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, /* resize all orig nodes because orig_node->bcast_own(_sum) depend on * if_num */ - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { @@ -1130,7 +1105,7 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, int max_if_num) { struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_head *head; struct batadv_hard_iface *hard_iface_tmp; struct batadv_orig_node *orig_node; @@ -1141,8 +1116,8 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, /* resize all orig nodes because orig_node->bcast_own(_sum) depend on * if_num */ - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->orig_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { diff --git a/originator.h b/originator.h index a179c03..d7180ed 100644 --- a/originator.h +++ b/originator.h @@ -84,16 +84,13 @@ static inline uint32_t batadv_choose_orig(const void *data, uint32_t size) static inline struct batadv_orig_node * batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) { - struct batadv_hashtable *hash = bat_priv->orig_hash; + struct batadv_hashbucket *hash = bat_priv->orig_hash; struct hlist_head *head; struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; int index; - if (!hash) - return NULL; - - index = batadv_choose_orig(data, hash->size); - head = &hash->table[index]; + index = batadv_choose_orig(data, ARRAY_SIZE(bat_priv->orig_hash)); + head = &hash[index].head; rcu_read_lock(); hlist_for_each_entry_rcu(orig_node, head, hash_entry) { diff --git a/translation-table.c b/translation-table.c index b20812b..494de64 100644 --- a/translation-table.c +++ b/translation-table.c @@ -28,10 +28,6 @@ #include <linux/crc32c.h> -/* hash class keys */ -static struct lock_class_key batadv_tt_local_hash_lock_class_key; -static struct lock_class_key batadv_tt_global_hash_lock_class_key; - static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client, unsigned short vid, struct batadv_orig_node *orig_node); @@ -82,22 +78,32 @@ static inline uint32_t batadv_choose_tt(const void *data, uint32_t size) * Returns a pointer to the tt_common struct belonging to the searched client if * found, NULL otherwise. */ +#define batadv_tt_hash_find(hash, addr, vid) \ + _batadv_tt_hash_find(hash, ARRAY_SIZE(hash), addr, vid) + +/** + * _batadv_tt_hash_find - look for a client in the given hash table + * @hash: the hash table to search + * @hash_size: number of buckets in the hashtable + * @addr: the mac address of the client to look for + * @vid: VLAN identifier + * + * Returns a pointer to the tt_common struct belonging to the searched client if + * found, NULL otherwise. + */ static struct batadv_tt_common_entry * -batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr, - unsigned short vid) +_batadv_tt_hash_find(struct batadv_hashbucket *hash, uint32_t hash_size, + const uint8_t *addr, unsigned short vid) { struct hlist_head *head; struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL; uint32_t index; - if (!hash) - return NULL; - ether_addr_copy(to_search.addr, addr); to_search.vid = vid; - index = batadv_choose_tt(&to_search, hash->size); - head = &hash->table[index]; + index = batadv_choose_tt(&to_search, hash_size); + head = &hash[index].head; rcu_read_lock(); hlist_for_each_entry_rcu(tt, head, hash_entry) { @@ -460,16 +466,7 @@ static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv) static int batadv_tt_local_init(struct batadv_priv *bat_priv) { - if (bat_priv->tt.local_hash) - return 0; - - bat_priv->tt.local_hash = batadv_hash_new(1024); - - if (!bat_priv->tt.local_hash) - return -ENOMEM; - - batadv_hash_set_lock_class(bat_priv->tt.local_hash, - &batadv_tt_local_hash_lock_class_key); + batadv_hash_init(bat_priv->tt.local_hash); return 0; } @@ -597,8 +594,9 @@ bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr, is_multicast_ether_addr(addr)) tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE; - hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt, - batadv_choose_tt, &tt_local->common, + hash_added = batadv_hash_add(bat_priv->tt.local_hash, + batadv_compare_tt, batadv_choose_tt, + &tt_local->common, &tt_local->common.hash_entry); if (unlikely(hash_added != 0)) { @@ -898,7 +896,7 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); - struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_hashbucket *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_local_entry *tt_local; struct batadv_hard_iface *primary_if; @@ -922,8 +920,8 @@ int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset) seq_printf(seq, " %-13s %s %-8s %-9s (%-10s)\n", "Client", "VID", "Flags", "Last seen", "CRC"); - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.local_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, @@ -1097,14 +1095,14 @@ static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv, static void batadv_tt_local_purge(struct batadv_priv *bat_priv, int timeout) { - struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_hashbucket *hash = bat_priv->tt.local_hash; struct hlist_head *head; spinlock_t *list_lock; /* protects write access to the hash lists */ uint32_t i; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.local_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); batadv_tt_local_purge_list(bat_priv, head, timeout); @@ -1114,7 +1112,7 @@ static void batadv_tt_local_purge(struct batadv_priv *bat_priv, static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) { - struct batadv_hashtable *hash; + struct batadv_hashbucket *hash; spinlock_t *list_lock; /* protects write access to the hash lists */ struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_local_entry *tt_local; @@ -1123,14 +1121,11 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) struct hlist_head *head; uint32_t i; - if (!bat_priv->tt.local_hash) - return; - hash = bat_priv->tt.local_hash; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.local_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common_entry, node_tmp, @@ -1150,24 +1145,11 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) } spin_unlock_bh(list_lock); } - - batadv_hash_destroy(hash); - - bat_priv->tt.local_hash = NULL; } static int batadv_tt_global_init(struct batadv_priv *bat_priv) { - if (bat_priv->tt.global_hash) - return 0; - - bat_priv->tt.global_hash = batadv_hash_new(1024); - - if (!bat_priv->tt.global_hash) - return -ENOMEM; - - batadv_hash_set_lock_class(bat_priv->tt.global_hash, - &batadv_tt_global_hash_lock_class_key); + batadv_hash_init(bat_priv->tt.global_hash); return 0; } @@ -1569,7 +1551,7 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) { struct net_device *net_dev = (struct net_device *)seq->private; struct batadv_priv *bat_priv = netdev_priv(net_dev); - struct batadv_hashtable *hash = bat_priv->tt.global_hash; + struct batadv_hashbucket *hash = bat_priv->tt.global_hash; struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_global_entry *tt_global; struct batadv_hard_iface *primary_if; @@ -1587,8 +1569,8 @@ int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset) "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)", "CRC", "Flags"); - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.global_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, @@ -1800,18 +1782,15 @@ void batadv_tt_global_del_orig(struct batadv_priv *bat_priv, struct batadv_tt_global_entry *tt_global; struct batadv_tt_common_entry *tt_common_entry; uint32_t i; - struct batadv_hashtable *hash = bat_priv->tt.global_hash; + struct batadv_hashbucket *hash = bat_priv->tt.global_hash; struct hlist_node *safe; struct hlist_head *head; spinlock_t *list_lock; /* protects write access to the hash lists */ unsigned short vid; - if (!hash) - return; - - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.global_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common_entry, safe, @@ -1866,7 +1845,7 @@ static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global, static void batadv_tt_global_purge(struct batadv_priv *bat_priv) { - struct batadv_hashtable *hash = bat_priv->tt.global_hash; + struct batadv_hashbucket *hash = bat_priv->tt.global_hash; struct hlist_head *head; struct hlist_node *node_tmp; spinlock_t *list_lock; /* protects write access to the hash lists */ @@ -1875,9 +1854,9 @@ static void batadv_tt_global_purge(struct batadv_priv *bat_priv) struct batadv_tt_common_entry *tt_common; struct batadv_tt_global_entry *tt_global; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.global_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common, node_tmp, head, @@ -1905,7 +1884,7 @@ static void batadv_tt_global_purge(struct batadv_priv *bat_priv) static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) { - struct batadv_hashtable *hash; + struct batadv_hashbucket *hash; spinlock_t *list_lock; /* protects write access to the hash lists */ struct batadv_tt_common_entry *tt_common_entry; struct batadv_tt_global_entry *tt_global; @@ -1913,14 +1892,11 @@ static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) struct hlist_head *head; uint32_t i; - if (!bat_priv->tt.global_hash) - return; - hash = bat_priv->tt.global_hash; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.global_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common_entry, node_tmp, @@ -1933,10 +1909,6 @@ static void batadv_tt_global_table_free(struct batadv_priv *bat_priv) } spin_unlock_bh(list_lock); } - - batadv_hash_destroy(hash); - - bat_priv->tt.global_hash = NULL; } static bool @@ -2045,7 +2017,7 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, struct batadv_orig_node *orig_node, unsigned short vid) { - struct batadv_hashtable *hash = bat_priv->tt.global_hash; + struct batadv_hashbucket *hash = bat_priv->tt.global_hash; struct batadv_tt_common_entry *tt_common; struct batadv_tt_global_entry *tt_global; struct hlist_head *head; @@ -2053,8 +2025,8 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, uint8_t flags; __be16 tmp_vid; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.global_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common, head, hash_entry) { @@ -2121,15 +2093,15 @@ static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv, static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv, unsigned short vid) { - struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_hashbucket *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common; struct hlist_head *head; uint32_t i, crc_tmp, crc = 0; uint8_t flags; __be16 tmp_vid; - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.local_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common, head, hash_entry) { @@ -2284,14 +2256,16 @@ static int batadv_tt_global_valid(const void *entry_ptr, * specified tt hash * @bat_priv: the bat priv with all the soft interface information * @hash: hash table containing the tt entries + * @hash_size: number of buckets in the hashtable * @tt_len: expected tvlv tt data buffer length in number of bytes * @tvlv_buff: pointer to the buffer to fill with the TT data * @valid_cb: function to filter tt change entries * @cb_data: data passed to the filter function as argument */ static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, - struct batadv_hashtable *hash, - void *tvlv_buff, uint16_t tt_len, + struct batadv_hashbucket *hash, + uint32_t hash_size, void *tvlv_buff, + uint16_t tt_len, int (*valid_cb)(const void *, const void *), void *cb_data) { @@ -2305,8 +2279,8 @@ static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv, tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff; rcu_read_lock(); - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < hash_size; i++) { + head = &hash[i].head; hlist_for_each_entry_rcu(tt_common_entry, head, hash_entry) { @@ -2585,6 +2559,7 @@ static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv, /* fill the rest of the tvlv with the real TT entries */ batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash, + ARRAY_SIZE(bat_priv->tt.global_hash), tt_change, tt_len, batadv_tt_global_valid, req_dst_orig_node); @@ -2714,6 +2689,7 @@ static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv, /* fill the rest of the tvlv with the real TT entries */ batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash, + ARRAY_SIZE(bat_priv->tt.local_hash), tt_change, tt_len, batadv_tt_local_valid, NULL); } @@ -3110,17 +3086,14 @@ void batadv_tt_free(struct batadv_priv *bat_priv) static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, uint16_t flags, bool enable, bool count) { - struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_hashbucket *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common_entry; uint16_t changed_num = 0; struct hlist_head *head; uint32_t i; - if (!hash) - return; - - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.local_hash); i++) { + head = &hash[i].head; rcu_read_lock(); hlist_for_each_entry_rcu(tt_common_entry, @@ -3149,7 +3122,7 @@ static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv, /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) { - struct batadv_hashtable *hash = bat_priv->tt.local_hash; + struct batadv_hashbucket *hash = bat_priv->tt.local_hash; struct batadv_tt_common_entry *tt_common; struct batadv_tt_local_entry *tt_local; struct batadv_softif_vlan *vlan; @@ -3158,12 +3131,9 @@ static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv) spinlock_t *list_lock; /* protects write access to the hash lists */ uint32_t i; - if (!hash) - return; - - for (i = 0; i < hash->size; i++) { - head = &hash->table[i]; - list_lock = &hash->list_locks[i]; + for (i = 0; i < ARRAY_SIZE(bat_priv->tt.local_hash); i++) { + head = &hash[i].head; + list_lock = &hash[i].lock; spin_lock_bh(list_lock); hlist_for_each_entry_safe(tt_common, node_tmp, head, diff --git a/types.h b/types.h index 3b096c4..213007c 100644 --- a/types.h +++ b/types.h @@ -35,6 +35,16 @@ #endif /* CONFIG_BATMAN_ADV_DAT */ /** + * struct batadv_hashbucket - bucket for concurrent, list based hashtable + * @head: pointer to the data of this bucket + * @lock: lock protecting writes to this bucket + */ +struct batadv_hashbucket { + struct hlist_head head; + spinlock_t lock; /* Protects head */ +}; + +/** * enum batadv_dhcp_recipient - dhcp destination * @BATADV_DHCP_NO: packet is not a dhcp message * @BATADV_DHCP_TO_SERVER: dhcp message is directed to a server @@ -517,8 +527,8 @@ struct batadv_priv_tt { atomic_t ogm_append_cnt; atomic_t local_changes; struct list_head changes_list; - struct batadv_hashtable *local_hash; - struct batadv_hashtable *global_hash; + struct batadv_hashbucket local_hash[1024]; + struct batadv_hashbucket global_hash[1024]; struct list_head req_list; struct list_head roam_list; spinlock_t changes_list_lock; /* protects changes */ @@ -548,8 +558,8 @@ struct batadv_priv_tt { #ifdef CONFIG_BATMAN_ADV_BLA struct batadv_priv_bla { atomic_t num_requests; - struct batadv_hashtable *claim_hash; - struct batadv_hashtable *backbone_hash; + struct batadv_hashbucket claim_hash[128]; + struct batadv_hashbucket backbone_hash[32]; struct batadv_bcast_duplist_entry bcast_duplist[BATADV_DUPLIST_SIZE]; int bcast_duplist_curr; /* protects bcast_duplist & bcast_duplist_curr */ @@ -613,12 +623,13 @@ struct batadv_priv_tvlv { * struct batadv_priv_dat - per mesh interface DAT private data * @addr: node DAT address * @hash: hashtable representing the local ARP cache + * @hash_lock: locks for each hashtable buckets * @work: work queue callback item for cache purging */ #ifdef CONFIG_BATMAN_ADV_DAT struct batadv_priv_dat { batadv_dat_addr_t addr; - struct batadv_hashtable *hash; + struct batadv_hashbucket hash[1024]; struct delayed_work work; }; #endif @@ -681,8 +692,8 @@ struct batadv_priv_nc { u32 max_buffer_time; unsigned long timestamp_fwd_flush; unsigned long timestamp_sniffed_purge; - struct batadv_hashtable *coding_hash; - struct batadv_hashtable *decoding_hash; + struct batadv_hashbucket coding_hash[128]; + struct batadv_hashbucket decoding_hash[128]; }; /** @@ -795,7 +806,7 @@ struct batadv_priv { struct dentry *debug_dir; struct hlist_head forw_bat_list; struct hlist_head forw_bcast_list; - struct batadv_hashtable *orig_hash; + struct batadv_hashbucket orig_hash[1024]; spinlock_t forw_bat_list_lock; /* protects forw_bat_list */ spinlock_t forw_bcast_list_lock; /* protects forw_bcast_list */ struct delayed_work orig_work; -- 2.1.4

1 1

[B.A.T.M.A.N.] [RFCv3 1/3] batman-adv: Define the size of hashtables by hash bits
by Sven Eckelmann 01 Mar '15

01 Mar '15

The common hashtable implementation in the kernel uses bits of the hash to compute the final size of the hastable. Similar can be done for the partially locked, concurrent hashtables in batman-adv. The requirement of sizes with power two will allow better compiler optimization in the future. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- v3: - Rebased on master bridge_loop_avoidance.c | 6 ++++-- distributed-arp-table.c | 2 +- main.h | 9 +++++++++ network-coding.c | 7 +++++-- originator.c | 2 +- translation-table.c | 8 ++++++-- 6 files changed, 26 insertions(+), 8 deletions(-) diff --git a/bridge_loop_avoidance.c b/bridge_loop_avoidance.c index 6927589..c999d6b 100644 --- a/bridge_loop_avoidance.c +++ b/bridge_loop_avoidance.c @@ -1220,6 +1220,8 @@ int batadv_bla_init(struct batadv_priv *bat_priv) struct batadv_hard_iface *primary_if; uint16_t crc; unsigned long entrytime; + uint32_t hash_claim_size = 1u << BATADV_BLA_CLAIM_HASH_BITS; + uint32_t hash_backbone_size = 1u << BATADV_BLA_BACKBONE_HASH_BITS; spin_lock_init(&bat_priv->bla.bcast_duplist_lock); @@ -1246,8 +1248,8 @@ int batadv_bla_init(struct batadv_priv *bat_priv) if (bat_priv->bla.claim_hash) return 0; - bat_priv->bla.claim_hash = batadv_hash_new(128); - bat_priv->bla.backbone_hash = batadv_hash_new(32); + bat_priv->bla.claim_hash = batadv_hash_new(hash_claim_size); + bat_priv->bla.backbone_hash = batadv_hash_new(hash_backbone_size); if (!bat_priv->bla.claim_hash || !bat_priv->bla.backbone_hash) return -ENOMEM; diff --git a/distributed-arp-table.c b/distributed-arp-table.c index 107ad62..87ab637 100644 --- a/distributed-arp-table.c +++ b/distributed-arp-table.c @@ -725,7 +725,7 @@ int batadv_dat_init(struct batadv_priv *bat_priv) if (bat_priv->dat.hash) return 0; - bat_priv->dat.hash = batadv_hash_new(1024); + bat_priv->dat.hash = batadv_hash_new(1u << BATADV_DAT_HASH_BITS); if (!bat_priv->dat.hash) return -ENOMEM; diff --git a/main.h b/main.h index 4deacfd..26a20ae 100644 --- a/main.h +++ b/main.h @@ -154,6 +154,15 @@ enum batadv_uev_type { #define BATADV_DAT_CANDIDATE_NOT_FOUND 0 #define BATADV_DAT_CANDIDATE_ORIG 1 +#define BATADV_BLA_CLAIM_HASH_BITS 7 +#define BATADV_BLA_BACKBONE_HASH_BITS 5 +#define BATADV_NC_CODING_HASH_BITS 7 +#define BATADV_NC_DECODING_HASH_BITS 7 +#define BATADV_DAT_HASH_BITS 10 +#define BATADV_ORIG_HASH_BITS 10 +#define BATADV_TT_LOCAL_HASH_BITS 10 +#define BATADV_TT_GLOBAL_HASH_BITS 10 + /* Debug Messages */ #ifdef pr_fmt #undef pr_fmt diff --git a/network-coding.c b/network-coding.c index d128c3b..b70c34e 100644 --- a/network-coding.c +++ b/network-coding.c @@ -116,20 +116,23 @@ static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, */ int batadv_nc_mesh_init(struct batadv_priv *bat_priv) { + uint32_t hash_coding_size = 1u << BATADV_NC_CODING_HASH_BITS; + uint32_t hash_decoding_size = 1u << BATADV_NC_DECODING_HASH_BITS; + bat_priv->nc.timestamp_fwd_flush = jiffies; bat_priv->nc.timestamp_sniffed_purge = jiffies; if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) return 0; - bat_priv->nc.coding_hash = batadv_hash_new(128); + bat_priv->nc.coding_hash = batadv_hash_new(hash_coding_size); if (!bat_priv->nc.coding_hash) goto err; batadv_hash_set_lock_class(bat_priv->nc.coding_hash, &batadv_nc_coding_hash_lock_class_key); - bat_priv->nc.decoding_hash = batadv_hash_new(128); + bat_priv->nc.decoding_hash = batadv_hash_new(hash_decoding_size); if (!bat_priv->nc.decoding_hash) goto err; diff --git a/originator.c b/originator.c index 90e805a..34ca176 100644 --- a/originator.c +++ b/originator.c @@ -130,7 +130,7 @@ int batadv_originator_init(struct batadv_priv *bat_priv) if (bat_priv->orig_hash) return 0; - bat_priv->orig_hash = batadv_hash_new(1024); + bat_priv->orig_hash = batadv_hash_new(1u << BATADV_ORIG_HASH_BITS); if (!bat_priv->orig_hash) goto err; diff --git a/translation-table.c b/translation-table.c index b20812b..1562e26 100644 --- a/translation-table.c +++ b/translation-table.c @@ -460,10 +460,12 @@ static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv) static int batadv_tt_local_init(struct batadv_priv *bat_priv) { + uint32_t hash_size = 1u << BATADV_TT_LOCAL_HASH_BITS; + if (bat_priv->tt.local_hash) return 0; - bat_priv->tt.local_hash = batadv_hash_new(1024); + bat_priv->tt.local_hash = batadv_hash_new(hash_size); if (!bat_priv->tt.local_hash) return -ENOMEM; @@ -1158,10 +1160,12 @@ static void batadv_tt_local_table_free(struct batadv_priv *bat_priv) static int batadv_tt_global_init(struct batadv_priv *bat_priv) { + uint32_t hash_size = 1u << BATADV_TT_GLOBAL_HASH_BITS; + if (bat_priv->tt.global_hash) return 0; - bat_priv->tt.global_hash = batadv_hash_new(1024); + bat_priv->tt.global_hash = batadv_hash_new(hash_size); if (!bat_priv->tt.global_hash) return -ENOMEM; -- 2.1.4

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[B.A.T.M.A.N.] [PATCH 1/2] batman-adv: split name from variable for uint mesh attributes
by Marek Lindner 01 Mar '15

01 Mar '15

From: Antonio Quartulli <antonio(a)open-mesh.com> Some mesh attributes are behind substructs in the batadv_priv object and for this reason the name cannot be used anymore to refer to them. This patch allows to specify the variable name where the attribute is stored inside batadv_priv instead of using the name Signed-off-by: Antonio Quartulli <antonio(a)open-mesh.com> --- sysfs.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) diff --git a/sysfs.c b/sysfs.c index a63c3eb..97a6192 100644 --- a/sysfs.c +++ b/sysfs.c @@ -151,7 +151,7 @@ ssize_t batadv_show_##_name(struct kobject *kobj, \ static BATADV_ATTR(_name, _mode, batadv_show_##_name, \ batadv_store_##_name) -#define BATADV_ATTR_SIF_STORE_UINT(_name, _min, _max, _post_func) \ +#define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \ ssize_t batadv_store_##_name(struct kobject *kobj, \ struct attribute *attr, char *buff, \ size_t count) \ @@ -161,24 +161,24 @@ ssize_t batadv_store_##_name(struct kobject *kobj, \ \ return __batadv_store_uint_attr(buff, count, _min, _max, \ _post_func, attr, \ - &bat_priv->_name, net_dev); \ + &bat_priv->_var, net_dev); \ } -#define BATADV_ATTR_SIF_SHOW_UINT(_name) \ +#define BATADV_ATTR_SIF_SHOW_UINT(_name, _var) \ ssize_t batadv_show_##_name(struct kobject *kobj, \ struct attribute *attr, char *buff) \ { \ struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj); \ \ - return sprintf(buff, "%i\n", atomic_read(&bat_priv->_name)); \ + return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var)); \ } \ /* Use this, if you are going to set [name] in the soft-interface * (bat_priv) to an unsigned integer value */ -#define BATADV_ATTR_SIF_UINT(_name, _mode, _min, _max, _post_func) \ - static BATADV_ATTR_SIF_STORE_UINT(_name, _min, _max, _post_func)\ - static BATADV_ATTR_SIF_SHOW_UINT(_name) \ +#define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\ + static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\ + static BATADV_ATTR_SIF_SHOW_UINT(_name, _var) \ static BATADV_ATTR(_name, _mode, batadv_show_##_name, \ batadv_store_##_name) @@ -540,19 +540,20 @@ BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu); static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL); static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode, batadv_store_gw_mode); -BATADV_ATTR_SIF_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * BATADV_JITTER, - INT_MAX, NULL); -BATADV_ATTR_SIF_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, BATADV_TQ_MAX_VALUE, - NULL); -BATADV_ATTR_SIF_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, BATADV_TQ_MAX_VALUE, - batadv_post_gw_reselect); +BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, S_IRUGO | S_IWUSR, + 2 * BATADV_JITTER, INT_MAX, NULL); +BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, S_IRUGO | S_IWUSR, 0, + BATADV_TQ_MAX_VALUE, NULL); +BATADV_ATTR_SIF_UINT(gw_sel_class, gw_sel_class, S_IRUGO | S_IWUSR, 1, + BATADV_TQ_MAX_VALUE, batadv_post_gw_reselect); static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth, batadv_store_gw_bwidth); #ifdef CONFIG_BATMAN_ADV_MCAST BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL); #endif #ifdef CONFIG_BATMAN_ADV_DEBUG -BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL); +BATADV_ATTR_SIF_UINT(log_level, log_level, S_IRUGO | S_IWUSR, 0, + BATADV_DBG_ALL, NULL); #endif #ifdef CONFIG_BATMAN_ADV_NC BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR, -- 2.1.4

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[B.A.T.M.A.N.] [PATCHv3] batman-adv: Use common Jenkins Hash implementation
by Sven Eckelmann 01 Mar '15

01 Mar '15

An unoptimized version of the Jenkins one-at-a-time hash function is used and partially copied all over the code wherever an hashtable is used. Instead the optimized version shared between the whole kernel should be used to reduce code duplication and use better optimized code. Only the DAT code must use the old implementation because it is used as distributed hash function which has to be common for all nodes. Signed-off-by: Sven Eckelmann <sven(a)narfation.org> --- v3: rebased on top of current master bridge_loop_avoidance.c | 16 ++++------------ distributed-arp-table.c | 17 +++++++++++++++-- hash.h | 22 ---------------------- main.h | 1 + network-coding.c | 10 ++-------- originator.h | 13 +------------ translation-table.c | 8 ++------ 7 files changed, 25 insertions(+), 62 deletions(-) diff --git a/bridge_loop_avoidance.c b/bridge_loop_avoidance.c index ac4b96e..6927589 100644 --- a/bridge_loop_avoidance.c +++ b/bridge_loop_avoidance.c @@ -42,12 +42,8 @@ static inline uint32_t batadv_choose_claim(const void *data, uint32_t size) struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; uint32_t hash = 0; - hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); - hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); - - hash += (hash << 3); - hash ^= (hash >> 11); - hash += (hash << 15); + hash = jhash(&claim->addr, sizeof(claim->addr), hash); + hash = jhash(&claim->vid, sizeof(claim->vid), hash); return hash % size; } @@ -59,12 +55,8 @@ static inline uint32_t batadv_choose_backbone_gw(const void *data, const struct batadv_bla_claim *claim = (struct batadv_bla_claim *)data; uint32_t hash = 0; - hash = batadv_hash_bytes(hash, &claim->addr, sizeof(claim->addr)); - hash = batadv_hash_bytes(hash, &claim->vid, sizeof(claim->vid)); - - hash += (hash << 3); - hash ^= (hash >> 11); - hash += (hash << 15); + hash = jhash(&claim->addr, sizeof(claim->addr), hash); + hash = jhash(&claim->vid, sizeof(claim->vid), hash); return hash % size; } diff --git a/distributed-arp-table.c b/distributed-arp-table.c index aad022d..107ad62 100644 --- a/distributed-arp-table.c +++ b/distributed-arp-table.c @@ -206,9 +206,22 @@ static uint32_t batadv_hash_dat(const void *data, uint32_t size) { uint32_t hash = 0; const struct batadv_dat_entry *dat = data; + const unsigned char *key; + uint32_t i; + + key = (const unsigned char *)&dat->ip; + for (i = 0; i < sizeof(dat->ip); i++) { + hash += key[i]; + hash += (hash << 10); + hash ^= (hash >> 6); + } - hash = batadv_hash_bytes(hash, &dat->ip, sizeof(dat->ip)); - hash = batadv_hash_bytes(hash, &dat->vid, sizeof(dat->vid)); + key = (const unsigned char *)&dat->vid; + for (i = 0; i < sizeof(dat->vid); i++) { + hash += key[i]; + hash += (hash << 10); + hash ^= (hash >> 6); + } hash += (hash << 3); hash ^= (hash >> 11); diff --git a/hash.h b/hash.h index 539fc12..a1d0980 100644 --- a/hash.h +++ b/hash.h @@ -80,28 +80,6 @@ static inline void batadv_hash_delete(struct batadv_hashtable *hash, } /** - * batadv_hash_bytes - hash some bytes and add them to the previous hash - * @hash: previous hash value - * @data: data to be hashed - * @size: number of bytes to be hashed - * - * Returns the new hash value. - */ -static inline uint32_t batadv_hash_bytes(uint32_t hash, const void *data, - uint32_t size) -{ - const unsigned char *key = data; - int i; - - for (i = 0; i < size; i++) { - hash += key[i]; - hash += (hash << 10); - hash ^= (hash >> 6); - } - return hash; -} - -/** * batadv_hash_add - adds data to the hashtable * @hash: storage hash table * @compare: callback to determine if 2 hash elements are identical diff --git a/main.h b/main.h index b6c9ece..4deacfd 100644 --- a/main.h +++ b/main.h @@ -174,6 +174,7 @@ enum batadv_uev_type { #include <linux/workqueue.h> /* workqueue */ #include <linux/percpu.h> #include <linux/slab.h> +#include <linux/jhash.h> #include <net/sock.h> /* struct sock */ #include <net/addrconf.h> /* ipv6 address stuff */ #include <linux/ip.h> diff --git a/network-coding.c b/network-coding.c index 358e58c..d128c3b 100644 --- a/network-coding.c +++ b/network-coding.c @@ -453,14 +453,8 @@ static uint32_t batadv_nc_hash_choose(const void *data, uint32_t size) const struct batadv_nc_path *nc_path = data; uint32_t hash = 0; - hash = batadv_hash_bytes(hash, &nc_path->prev_hop, - sizeof(nc_path->prev_hop)); - hash = batadv_hash_bytes(hash, &nc_path->next_hop, - sizeof(nc_path->next_hop)); - - hash += (hash << 3); - hash ^= (hash >> 11); - hash += (hash << 15); + hash = jhash(&nc_path->prev_hop, sizeof(nc_path->prev_hop), hash); + hash = jhash(&nc_path->next_hop, sizeof(nc_path->next_hop), hash); return hash % size; } diff --git a/originator.h b/originator.h index aa4a436..a179c03 100644 --- a/originator.h +++ b/originator.h @@ -75,20 +75,9 @@ void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan); */ static inline uint32_t batadv_choose_orig(const void *data, uint32_t size) { - const unsigned char *key = data; uint32_t hash = 0; - size_t i; - - for (i = 0; i < 6; i++) { - hash += key[i]; - hash += (hash << 10); - hash ^= (hash >> 6); - } - - hash += (hash << 3); - hash ^= (hash >> 11); - hash += (hash << 15); + hash = jhash(data, ETH_ALEN, hash); return hash % size; } diff --git a/translation-table.c b/translation-table.c index 07b263a..b20812b 100644 --- a/translation-table.c +++ b/translation-table.c @@ -67,12 +67,8 @@ static inline uint32_t batadv_choose_tt(const void *data, uint32_t size) uint32_t hash = 0; tt = (struct batadv_tt_common_entry *)data; - hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN); - hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid)); - - hash += (hash << 3); - hash ^= (hash >> 11); - hash += (hash << 15); + hash = jhash(&tt->addr, ETH_ALEN, hash); + hash = jhash(&tt->vid, sizeof(tt->vid), hash); return hash % size; } -- 2.1.4

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B.A.T.M.A.N March 2015