diff options
Diffstat (limited to 'src/internal_cache.c')
| -rw-r--r-- | src/internal_cache.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/src/internal_cache.c b/src/internal_cache.c index 952327d..ba2d74b 100644 --- a/src/internal_cache.c +++ b/src/internal_cache.c @@ -32,12 +32,25 @@ static int internal_cache_init(void) dlog(LOG_ERR, "can't allocate memory for the internal cache"); return -1; } + + STATE(mode)->internal->exp.data = + cache_create("internal", CACHE_T_EXP, + STATE_SYNC(sync)->internal_cache_flags, + STATE_SYNC(sync)->internal_cache_extra, + &cache_sync_internal_exp_ops); + + if (!STATE(mode)->internal->exp.data) { + dlog(LOG_ERR, "can't allocate memory for the internal cache"); + return -1; + } + return 0; } static void internal_cache_close(void) { cache_destroy(STATE(mode)->internal->ct.data); + cache_destroy(STATE(mode)->internal->exp.data); } static void internal_cache_ct_dump(int fd, int type) @@ -203,6 +216,154 @@ static int internal_cache_ct_event_del(struct nf_conntrack *ct, int origin) return 1; } +static void internal_cache_exp_dump(int fd, int type) +{ + cache_dump(STATE(mode)->internal->exp.data, fd, type); +} + +static void internal_cache_exp_flush(void) +{ + cache_flush(STATE(mode)->internal->exp.data); +} + +static void internal_cache_exp_stats(int fd) +{ + cache_stats(STATE(mode)->internal->exp.data, fd); +} + +static void internal_cache_exp_stats_ext(int fd) +{ + cache_stats_extended(STATE(mode)->internal->exp.data, fd); +} + +static void internal_cache_exp_populate(struct nf_expect *exp) +{ + cache_update_force(STATE(mode)->internal->exp.data, exp); +} + +static int internal_cache_exp_purge_step(void *data1, void *data2) +{ + struct cache_object *obj = data2; + + STATE(get_retval) = 0; + nl_get_expect(STATE(get), obj->ptr); /* modifies STATE(get_reval) */ + if (!STATE(get_retval)) { + if (obj->status != C_OBJ_DEAD) { + cache_object_set_status(obj, C_OBJ_DEAD); + sync_send(obj, NET_T_STATE_EXP_DEL); + cache_object_put(obj); + } + } + + return 0; +} + +static void internal_cache_exp_purge(void) +{ + cache_iterate(STATE(mode)->internal->exp.data, NULL, + internal_cache_exp_purge_step); +} + +static int +internal_cache_exp_resync(enum nf_conntrack_msg_type type, + struct nf_expect *exp, void *data) +{ + struct cache_object *obj; + const struct nf_conntrack *master = + nfexp_get_attr(exp, ATTR_EXP_MASTER); + + if (!exp_filter_find(STATE(exp_filter), exp)) + return NFCT_CB_CONTINUE; + + if (ct_filter_conntrack(master, 1)) + return NFCT_CB_CONTINUE; + + obj = cache_update_force(STATE(mode)->internal->exp.data, exp); + if (obj == NULL) + return NFCT_CB_CONTINUE; + + switch (obj->status) { + case C_OBJ_NEW: + sync_send(obj, NET_T_STATE_EXP_NEW); + break; + case C_OBJ_ALIVE: + sync_send(obj, NET_T_STATE_EXP_UPD); + break; + } + return NFCT_CB_CONTINUE; +} + +static void internal_cache_exp_event_new(struct nf_expect *exp, int origin) +{ + struct cache_object *obj; + int id; + + /* this event has been triggered by a direct inject, skip */ + if (origin == CTD_ORIGIN_INJECT) + return; + + obj = cache_find(STATE(mode)->internal->exp.data, exp, &id); + if (obj == NULL) { +retry: + obj = cache_object_new(STATE(mode)->internal->exp.data, exp); + if (obj == NULL) + return; + if (cache_add(STATE(mode)->internal->exp.data, obj, id) == -1) { + cache_object_free(obj); + return; + } + /* only synchronize events that have been triggered by other + * processes or the kernel, but don't propagate events that + * have been triggered by conntrackd itself, eg. commits. */ + if (origin == CTD_ORIGIN_NOT_ME) + sync_send(obj, NET_T_STATE_EXP_NEW); + } else { + cache_del(STATE(mode)->internal->exp.data, obj); + cache_object_free(obj); + goto retry; + } +} + +static void internal_cache_exp_event_upd(struct nf_expect *exp, int origin) +{ + struct cache_object *obj; + + /* this event has been triggered by a direct inject, skip */ + if (origin == CTD_ORIGIN_INJECT) + return; + + obj = cache_update_force(STATE(mode)->internal->exp.data, exp); + if (obj == NULL) + return; + + if (origin == CTD_ORIGIN_NOT_ME) + sync_send(obj, NET_T_STATE_EXP_UPD); +} + +static int internal_cache_exp_event_del(struct nf_expect *exp, int origin) +{ + struct cache_object *obj; + int id; + + /* this event has been triggered by a direct inject, skip */ + if (origin == CTD_ORIGIN_INJECT) + return 0; + + /* we don't synchronize events for objects that are not in the cache */ + obj = cache_find(STATE(mode)->internal->exp.data, exp, &id); + if (obj == NULL) + return 0; + + if (obj->status != C_OBJ_DEAD) { + cache_object_set_status(obj, C_OBJ_DEAD); + if (origin == CTD_ORIGIN_NOT_ME) { + sync_send(obj, NET_T_STATE_EXP_DEL); + } + cache_object_put(obj); + } + return 1; +} + struct internal_handler internal_cache = { .flags = INTERNAL_F_POPULATE | INTERNAL_F_RESYNC, .init = internal_cache_init, @@ -219,4 +380,16 @@ struct internal_handler internal_cache = { .upd = internal_cache_ct_event_upd, .del = internal_cache_ct_event_del, }, + .exp = { + .dump = internal_cache_exp_dump, + .flush = internal_cache_exp_flush, + .stats = internal_cache_exp_stats, + .stats_ext = internal_cache_exp_stats_ext, + .populate = internal_cache_exp_populate, + .purge = internal_cache_exp_purge, + .resync = internal_cache_exp_resync, + .new = internal_cache_exp_event_new, + .upd = internal_cache_exp_event_upd, + .del = internal_cache_exp_event_del, + }, }; 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