From e678dcbf0336c3ca10f9fe2fae8b19347b6c1d4d Mon Sep 17 00:00:00 2001 From: Steven Barth Date: Sun, 13 Apr 2014 18:48:39 +0200 Subject: [PATCH] Add support for netifd-generated rules Signed-off-by: Steven Barth --- main.c | 8 +++-- options.c | 101 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ options.h | 3 ++ rules.c | 76 +++++++++++++++++++++++++++------------- rules.h | 9 +++-- snats.c | 57 +++++++++++++++++++++++------- snats.h | 9 +++-- ubus.c | 40 +++++++++++++++++++++ ubus.h | 2 ++ 9 files changed, 261 insertions(+), 44 deletions(-) diff --git a/main.c b/main.c index bc1cfd7..27d5298 100644 --- a/main.c +++ b/main.c @@ -98,12 +98,16 @@ build_state(bool runtime) cfg_state = state; } + + struct blob_buf b = {NULL, NULL, 0, NULL}; + fw3_ubus_rules(&b); + fw3_load_defaults(state, p); fw3_load_ipsets(state, p); fw3_load_zones(state, p); - fw3_load_rules(state, p); + fw3_load_rules(state, p, b.head); fw3_load_redirects(state, p); - fw3_load_snats(state, p); + fw3_load_snats(state, p, b.head); fw3_load_forwards(state, p); fw3_load_includes(state, p); diff --git a/options.c b/options.c index 1dbdca8..80e5542 100644 --- a/options.c +++ b/options.c @@ -964,6 +964,107 @@ fw3_parse_options(void *s, const struct fw3_option *opts, } +bool +fw3_parse_blob_options(void *s, const struct fw3_option *opts, + struct blob_attr *a) +{ + char *p, *v, buf[16]; + bool known; + unsigned rem, erem; + struct blob_attr *o, *e; + const struct fw3_option *opt; + struct list_head *dest; + bool valid = true; + + blobmsg_for_each_attr(o, a, rem) + { + known = false; + + for (opt = opts; opt->name; opt++) + { + if (!opt->parse) + continue; + + if (strcmp(opt->name, blobmsg_name(o))) + continue; + + if (blobmsg_type(o) == BLOBMSG_TYPE_ARRAY) + { + if (!opt->elem_size) + { + fprintf(stderr, "%s must not be a list\n", opt->name); + valid = false; + } + else + { + dest = (struct list_head *)((char *)s + opt->offset); + + blobmsg_for_each_attr(e, o, erem) + { + if (blobmsg_type(e) == BLOBMSG_TYPE_INT32) { + snprintf(buf, sizeof(buf), "%d", blobmsg_get_u32(e)); + v = buf; + } else { + v = blobmsg_get_string(e); + } + + if (!opt->parse(dest, v, true)) + { + fprintf(stderr, "%s has invalid value '%s'\n", opt->name, v); + valid = false; + continue; + } + } + } + } + else + { + if (blobmsg_type(o) == BLOBMSG_TYPE_INT32) { + snprintf(buf, sizeof(buf), "%d", blobmsg_get_u32(o)); + v = buf; + } else { + v = blobmsg_get_string(o); + } + + if (!v) + continue; + + if (!opt->elem_size) + { + if (!opt->parse((char *)s + opt->offset, v, false)) + { + fprintf(stderr, "%s has invalid value '%s'\n", opt->name, v); + valid = false; + } + } + else + { + dest = (struct list_head *)((char *)s + opt->offset); + + for (p = strtok(v, " \t"); p != NULL; p = strtok(NULL, " \t")) + { + if (!opt->parse(dest, p, true)) + { + fprintf(stderr, "%s has invalid value '%s'\n", opt->name, p); + valid = false; + continue; + } + } + } + } + + known = true; + break; + } + + if (!known) + fprintf(stderr, "%s is unknown\n", blobmsg_name(o)); + } + + return valid; +} + + const char * fw3_address_to_string(struct fw3_address *address, bool allow_invert) { diff --git a/options.h b/options.h index 30c0a95..0a2fa7f 100644 --- a/options.h +++ b/options.h @@ -41,6 +41,7 @@ #include #include +#include #include "icmp_codes.h" #include "utils.h" @@ -558,6 +559,8 @@ bool fw3_parse_direction(void *ptr, const char *val, bool is_list); bool fw3_parse_options(void *s, const struct fw3_option *opts, struct uci_section *section); +bool fw3_parse_blob_options(void *s, const struct fw3_option *opts, + struct blob_attr *a); const char * fw3_address_to_string(struct fw3_address *address, bool allow_invert); diff --git a/rules.c b/rules.c index b41dfac..f45de6e 100644 --- a/rules.c +++ b/rules.c @@ -72,41 +72,71 @@ need_src_action_chain(struct fw3_rule *r) return (r->_src && r->_src->log && (r->target > FW3_FLAG_ACCEPT)); } +static struct fw3_rule* +alloc_rule(struct fw3_state *state) +{ + struct fw3_rule *rule = calloc(1, sizeof(*rule)); + + if (rule) { + INIT_LIST_HEAD(&rule->proto); + + INIT_LIST_HEAD(&rule->ip_src); + INIT_LIST_HEAD(&rule->mac_src); + INIT_LIST_HEAD(&rule->port_src); + + INIT_LIST_HEAD(&rule->ip_dest); + INIT_LIST_HEAD(&rule->port_dest); + + INIT_LIST_HEAD(&rule->icmp_type); + + list_add_tail(&rule->list, &state->rules); + rule->enabled = true; + } + + return rule; +} + void -fw3_load_rules(struct fw3_state *state, struct uci_package *p) +fw3_load_rules(struct fw3_state *state, struct uci_package *p, + struct blob_attr *a) { struct uci_section *s; struct uci_element *e; - struct fw3_rule *rule; + struct fw3_rule *rule, *n; + struct blob_attr *entry, *opt; + unsigned rem, orem; INIT_LIST_HEAD(&state->rules); - uci_foreach_element(&p->sections, e) - { - s = uci_to_section(e); + blob_for_each_attr(entry, a, rem) { + const char *type = NULL; + blobmsg_for_each_attr(opt, entry, orem) + if (!strcmp(blobmsg_name(opt), "type")) + type = blobmsg_get_string(opt); - if (strcmp(s->type, "rule")) + if (!type || strcmp(type, "rule")) continue; - rule = malloc(sizeof(*rule)); - - if (!rule) + if (!(rule = alloc_rule(state))) continue; - memset(rule, 0, sizeof(*rule)); - - INIT_LIST_HEAD(&rule->proto); - - INIT_LIST_HEAD(&rule->ip_src); - INIT_LIST_HEAD(&rule->mac_src); - INIT_LIST_HEAD(&rule->port_src); + if (!fw3_parse_blob_options(rule, fw3_rule_opts, entry)) + { + fprintf(stderr, "ubus section skipped due to invalid options\n"); + fw3_free_rule(rule); + continue; + } + } - INIT_LIST_HEAD(&rule->ip_dest); - INIT_LIST_HEAD(&rule->port_dest); + uci_foreach_element(&p->sections, e) + { + s = uci_to_section(e); - INIT_LIST_HEAD(&rule->icmp_type); + if (strcmp(s->type, "rule")) + continue; - rule->enabled = true; + if (!(rule = alloc_rule(state))) + continue; if (!fw3_parse_options(rule, fw3_rule_opts, s)) { @@ -114,7 +144,10 @@ fw3_load_rules(struct fw3_state *state, struct uci_package *p) fw3_free_rule(rule); continue; } + } + list_for_each_entry_safe(rule, n, &state->rules, list) + { if (!rule->enabled) { fw3_free_rule(rule); @@ -219,9 +252,6 @@ fw3_load_rules(struct fw3_state *state, struct uci_package *p) setbit(rule->_src->flags[0], fw3_to_src_target(rule->target)); setbit(rule->_src->flags[1], fw3_to_src_target(rule->target)); } - - list_add_tail(&rule->list, &state->rules); - continue; } } diff --git a/rules.h b/rules.h index 6d332fc..bdd36a2 100644 --- a/rules.h +++ b/rules.h @@ -27,10 +27,13 @@ extern const struct fw3_option fw3_rule_opts[]; -void fw3_load_rules(struct fw3_state *state, struct uci_package *p); +void fw3_load_rules(struct fw3_state *state, struct uci_package *p, struct blob_attr *a); void fw3_print_rules(struct fw3_ipt_handle *handle, struct fw3_state *state); -#define fw3_free_rule(rule) \ - fw3_free_object(rule, fw3_rule_opts) +static inline void fw3_free_rule(struct fw3_rule *rule) +{ + list_del(&rule->list); + fw3_free_object(rule, fw3_rule_opts); +} #endif diff --git a/snats.c b/snats.c index 1e01192..7dae2ee 100644 --- a/snats.c +++ b/snats.c @@ -104,32 +104,62 @@ check_families(struct uci_element *e, struct fw3_snat *r) return true; } + +static struct fw3_snat* +alloc_snat(struct fw3_state *state) +{ + struct fw3_snat *snat = calloc(1, sizeof(*snat)); + + if (snat) { + INIT_LIST_HEAD(&snat->proto); + list_add_tail(&snat->list, &state->snats); + snat->enabled = true; + } + + return snat; +} + + void -fw3_load_snats(struct fw3_state *state, struct uci_package *p) +fw3_load_snats(struct fw3_state *state, struct uci_package *p, struct blob_attr *a) { struct uci_section *s; struct uci_element *e; - struct fw3_snat *snat; + struct fw3_snat *snat, *n; + struct blob_attr *rule, *opt; + unsigned rem, orem; INIT_LIST_HEAD(&state->snats); - uci_foreach_element(&p->sections, e) - { - s = uci_to_section(e); + blob_for_each_attr(rule, a, rem) { + const char *type = NULL; + blobmsg_for_each_attr(opt, rule, orem) + if (!strcmp(blobmsg_name(opt), "type")) + type = blobmsg_get_string(opt); - if (strcmp(s->type, "nat")) + if (!type || strcmp(type, "nat")) continue; - snat = malloc(sizeof(*snat)); + if (!(snat = alloc_snat(state))) + continue; - if (!snat) + if (!fw3_parse_blob_options(snat, fw3_snat_opts, rule)) + { + fprintf(stderr, "ubus section skipped due to invalid options\n"); + fw3_free_snat(snat); continue; + } + } - memset(snat, 0, sizeof(*snat)); + uci_foreach_element(&p->sections, e) + { + s = uci_to_section(e); - INIT_LIST_HEAD(&snat->proto); + if (strcmp(s->type, "nat")) + continue; - snat->enabled = true; + if (!(snat = alloc_snat(state))) + continue; if (!fw3_parse_options(snat, fw3_snat_opts, s)) { @@ -137,7 +167,10 @@ fw3_load_snats(struct fw3_state *state, struct uci_package *p) fw3_free_snat(snat); continue; } + } + list_for_each_entry_safe(snat, n, &state->snats, list) + { if (!snat->enabled) { fw3_free_snat(snat); @@ -220,8 +253,6 @@ fw3_load_snats(struct fw3_state *state, struct uci_package *p) set(snat->_src->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT); snat->_src->conntrack = true; } - - list_add_tail(&snat->list, &state->snats); } } diff --git a/snats.h b/snats.h index 00d1406..cf51151 100644 --- a/snats.h +++ b/snats.h @@ -27,10 +27,13 @@ extern const struct fw3_option fw3_snat_opts[]; -void fw3_load_snats(struct fw3_state *state, struct uci_package *p); +void fw3_load_snats(struct fw3_state *state, struct uci_package *p, struct blob_attr *a); void fw3_print_snats(struct fw3_ipt_handle *handle, struct fw3_state *state); -#define fw3_free_snat(redir) \ - fw3_free_object(redir, fw3_snat_opts) +static inline void fw3_free_snat(struct fw3_snat *snat) +{ + list_del(&snat->list); + fw3_free_object(snat, fw3_snat_opts); +} #endif diff --git a/ubus.c b/ubus.c index f8b0143..ec6d84f 100644 --- a/ubus.c +++ b/ubus.c @@ -212,3 +212,43 @@ fw3_ubus_zone_devices(struct fw3_zone *zone) fw3_parse_device(&zone->networks, name, true); } } + +void +fw3_ubus_rules(struct blob_buf *b) +{ + blob_buf_init(b, 0); + + struct blob_attr *c, *cur, *dcur, *rule, *ropt; + unsigned r, rem, drem, rrem, orem; + + blobmsg_for_each_attr(c, interfaces, r) { + const char *l3_device = NULL; + struct blob_attr *data = NULL; + + blobmsg_for_each_attr(cur, c, rem) { + if (!strcmp(blobmsg_name(cur), "l3_device")) + l3_device = blobmsg_get_string(cur); + else if (!strcmp(blobmsg_name(cur), "data")) + data = cur; + } + + if (!data || !l3_device) + continue; + + blobmsg_for_each_attr(dcur, data, drem) { + if (strcmp(blobmsg_name(dcur), "firewall")) + continue; + + blobmsg_for_each_attr(rule, dcur, rrem) { + void *k = blobmsg_open_table(b, ""); + + blobmsg_for_each_attr(ropt, rule, orem) + if (strcmp(blobmsg_name(ropt), "device")) + blobmsg_add_blob(b, ropt); + + blobmsg_add_string(b, "device", l3_device); + blobmsg_close_table(b, k); + } + } + } +} diff --git a/ubus.h b/ubus.h index 4c10481..35eac90 100644 --- a/ubus.h +++ b/ubus.h @@ -34,4 +34,6 @@ struct list_head * fw3_ubus_address(const char *net); void fw3_ubus_zone_devices(struct fw3_zone *zone); +void fw3_ubus_rules(struct blob_buf *b); + #endif -- 2.25.1