| /* |
| * (C) 2012-2014 by Pablo Neira Ayuso <pablo@netfilter.org> |
| * (C) 2013 by Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This code has been sponsored by Sophos Astaro <http://www.sophos.com> |
| */ |
| |
| #include <string.h> |
| #include <stdio.h> |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <arpa/inet.h> |
| #include <netinet/ip6.h> |
| #include <netdb.h> |
| |
| #include <xtables.h> |
| |
| #include <linux/netfilter/nf_tables.h> |
| #include "nft.h" |
| #include "nft-shared.h" |
| |
| static int nft_ipv6_add(struct nft_handle *h, struct nftnl_rule *r, |
| struct iptables_command_state *cs) |
| { |
| struct xtables_rule_match *matchp; |
| uint32_t op; |
| int ret; |
| |
| if (cs->fw6.ipv6.iniface[0] != '\0') { |
| op = nft_invflags2cmp(cs->fw6.ipv6.invflags, IPT_INV_VIA_IN); |
| add_iniface(h, r, cs->fw6.ipv6.iniface, op); |
| } |
| |
| if (cs->fw6.ipv6.outiface[0] != '\0') { |
| op = nft_invflags2cmp(cs->fw6.ipv6.invflags, IPT_INV_VIA_OUT); |
| add_outiface(h, r, cs->fw6.ipv6.outiface, op); |
| } |
| |
| if (cs->fw6.ipv6.proto != 0) { |
| op = nft_invflags2cmp(cs->fw6.ipv6.invflags, XT_INV_PROTO); |
| add_l4proto(h, r, cs->fw6.ipv6.proto, op); |
| } |
| |
| if (!IN6_IS_ADDR_UNSPECIFIED(&cs->fw6.ipv6.src) || |
| !IN6_IS_ADDR_UNSPECIFIED(&cs->fw6.ipv6.smsk) || |
| (cs->fw6.ipv6.invflags & IPT_INV_SRCIP)) { |
| op = nft_invflags2cmp(cs->fw6.ipv6.invflags, IPT_INV_SRCIP); |
| add_addr(h, r, NFT_PAYLOAD_NETWORK_HEADER, |
| offsetof(struct ip6_hdr, ip6_src), |
| &cs->fw6.ipv6.src, &cs->fw6.ipv6.smsk, |
| sizeof(struct in6_addr), op); |
| } |
| if (!IN6_IS_ADDR_UNSPECIFIED(&cs->fw6.ipv6.dst) || |
| !IN6_IS_ADDR_UNSPECIFIED(&cs->fw6.ipv6.dmsk) || |
| (cs->fw6.ipv6.invflags & IPT_INV_DSTIP)) { |
| op = nft_invflags2cmp(cs->fw6.ipv6.invflags, IPT_INV_DSTIP); |
| add_addr(h, r, NFT_PAYLOAD_NETWORK_HEADER, |
| offsetof(struct ip6_hdr, ip6_dst), |
| &cs->fw6.ipv6.dst, &cs->fw6.ipv6.dmsk, |
| sizeof(struct in6_addr), op); |
| } |
| add_compat(r, cs->fw6.ipv6.proto, cs->fw6.ipv6.invflags & XT_INV_PROTO); |
| |
| for (matchp = cs->matches; matchp; matchp = matchp->next) { |
| ret = add_match(h, r, matchp->match->m); |
| if (ret < 0) |
| return ret; |
| } |
| |
| /* Counters need to me added before the target, otherwise they are |
| * increased for each rule because of the way nf_tables works. |
| */ |
| if (add_counters(r, cs->counters.pcnt, cs->counters.bcnt) < 0) |
| return -1; |
| |
| return add_action(r, cs, !!(cs->fw6.ipv6.flags & IP6T_F_GOTO)); |
| } |
| |
| static bool nft_ipv6_is_same(const struct iptables_command_state *a, |
| const struct iptables_command_state *b) |
| { |
| if (memcmp(a->fw6.ipv6.src.s6_addr, b->fw6.ipv6.src.s6_addr, |
| sizeof(struct in6_addr)) != 0 |
| || memcmp(a->fw6.ipv6.dst.s6_addr, b->fw6.ipv6.dst.s6_addr, |
| sizeof(struct in6_addr)) != 0 |
| || a->fw6.ipv6.proto != b->fw6.ipv6.proto |
| || a->fw6.ipv6.flags != b->fw6.ipv6.flags |
| || a->fw6.ipv6.invflags != b->fw6.ipv6.invflags) { |
| DEBUGP("different src/dst/proto/flags/invflags\n"); |
| return false; |
| } |
| |
| return is_same_interfaces(a->fw6.ipv6.iniface, a->fw6.ipv6.outiface, |
| a->fw6.ipv6.iniface_mask, |
| a->fw6.ipv6.outiface_mask, |
| b->fw6.ipv6.iniface, b->fw6.ipv6.outiface, |
| b->fw6.ipv6.iniface_mask, |
| b->fw6.ipv6.outiface_mask); |
| } |
| |
| static void nft_ipv6_parse_meta(struct nft_xt_ctx *ctx, |
| const struct nft_xt_ctx_reg *reg, |
| struct nftnl_expr *e, |
| struct iptables_command_state *cs) |
| { |
| switch (reg->meta_dreg.key) { |
| case NFT_META_L4PROTO: |
| cs->fw6.ipv6.proto = nftnl_expr_get_u8(e, NFTNL_EXPR_CMP_DATA); |
| if (nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP) == NFT_CMP_NEQ) |
| cs->fw6.ipv6.invflags |= XT_INV_PROTO; |
| return; |
| default: |
| break; |
| } |
| |
| if (parse_meta(ctx, e, reg->meta_dreg.key, cs->fw6.ipv6.iniface, |
| cs->fw6.ipv6.iniface_mask, cs->fw6.ipv6.outiface, |
| cs->fw6.ipv6.outiface_mask, &cs->fw6.ipv6.invflags) == 0) |
| return; |
| |
| ctx->errmsg = "unknown ipv6 meta key"; |
| } |
| |
| static void parse_mask_ipv6(const struct nft_xt_ctx_reg *reg, |
| struct in6_addr *mask) |
| { |
| memcpy(mask, reg->bitwise.mask, sizeof(struct in6_addr)); |
| } |
| |
| static void nft_ipv6_parse_payload(struct nft_xt_ctx *ctx, |
| const struct nft_xt_ctx_reg *reg, |
| struct nftnl_expr *e, |
| struct iptables_command_state *cs) |
| { |
| struct in6_addr addr; |
| uint8_t proto; |
| bool inv; |
| |
| switch (reg->payload.offset) { |
| case offsetof(struct ip6_hdr, ip6_src): |
| get_cmp_data(e, &addr, sizeof(addr), &inv); |
| memcpy(cs->fw6.ipv6.src.s6_addr, &addr, sizeof(addr)); |
| if (reg->bitwise.set) |
| parse_mask_ipv6(reg, &cs->fw6.ipv6.smsk); |
| else |
| memset(&cs->fw6.ipv6.smsk, 0xff, |
| min(reg->payload.len, sizeof(struct in6_addr))); |
| |
| if (inv) |
| cs->fw6.ipv6.invflags |= IP6T_INV_SRCIP; |
| break; |
| case offsetof(struct ip6_hdr, ip6_dst): |
| get_cmp_data(e, &addr, sizeof(addr), &inv); |
| memcpy(cs->fw6.ipv6.dst.s6_addr, &addr, sizeof(addr)); |
| if (reg->bitwise.set) |
| parse_mask_ipv6(reg, &cs->fw6.ipv6.dmsk); |
| else |
| memset(&cs->fw6.ipv6.dmsk, 0xff, |
| min(reg->payload.len, sizeof(struct in6_addr))); |
| |
| if (inv) |
| cs->fw6.ipv6.invflags |= IP6T_INV_DSTIP; |
| break; |
| case offsetof(struct ip6_hdr, ip6_nxt): |
| get_cmp_data(e, &proto, sizeof(proto), &inv); |
| cs->fw6.ipv6.proto = proto; |
| if (inv) |
| cs->fw6.ipv6.invflags |= IP6T_INV_PROTO; |
| case offsetof(struct ip6_hdr, ip6_hlim): |
| if (nft_parse_hl(ctx, e, cs) < 0) |
| ctx->errmsg = "invalid ttl field match"; |
| break; |
| default: |
| DEBUGP("unknown payload offset %d\n", reg->payload.offset); |
| ctx->errmsg = "unknown payload offset"; |
| break; |
| } |
| } |
| |
| static void nft_ipv6_set_goto_flag(struct iptables_command_state *cs) |
| { |
| cs->fw6.ipv6.flags |= IP6T_F_GOTO; |
| } |
| |
| static void nft_ipv6_print_rule(struct nft_handle *h, struct nftnl_rule *r, |
| unsigned int num, unsigned int format) |
| { |
| struct iptables_command_state cs = {}; |
| |
| nft_rule_to_iptables_command_state(h, r, &cs); |
| |
| print_rule_details(num, &cs.counters, cs.jumpto, cs.fw6.ipv6.proto, |
| cs.fw6.ipv6.flags, cs.fw6.ipv6.invflags, format); |
| print_fragment(cs.fw6.ipv6.flags, cs.fw6.ipv6.invflags, format, true); |
| print_ifaces(cs.fw6.ipv6.iniface, cs.fw6.ipv6.outiface, |
| cs.fw6.ipv6.invflags, format); |
| print_ipv6_addresses(&cs.fw6, format); |
| |
| if (format & FMT_NOTABLE) |
| fputs(" ", stdout); |
| |
| if (cs.fw6.ipv6.flags & IP6T_F_GOTO) |
| printf("[goto] "); |
| |
| print_matches_and_target(&cs, format); |
| |
| if (!(format & FMT_NONEWLINE)) |
| fputc('\n', stdout); |
| |
| xtables_clear_iptables_command_state(&cs); |
| } |
| |
| static void nft_ipv6_save_rule(const struct iptables_command_state *cs, |
| unsigned int format) |
| { |
| save_ipv6_addr('s', &cs->fw6.ipv6.src, &cs->fw6.ipv6.smsk, |
| cs->fw6.ipv6.invflags & IP6T_INV_SRCIP); |
| save_ipv6_addr('d', &cs->fw6.ipv6.dst, &cs->fw6.ipv6.dmsk, |
| cs->fw6.ipv6.invflags & IP6T_INV_DSTIP); |
| |
| save_rule_details(cs->fw6.ipv6.iniface, cs->fw6.ipv6.iniface_mask, |
| cs->fw6.ipv6.outiface, cs->fw6.ipv6.outiface_mask, |
| cs->fw6.ipv6.proto, 0, cs->fw6.ipv6.invflags); |
| |
| save_matches_and_target(cs, cs->fw6.ipv6.flags & IP6T_F_GOTO, |
| &cs->fw6, format); |
| } |
| |
| static void xlate_ipv6_addr(const char *selector, const struct in6_addr *addr, |
| const struct in6_addr *mask, |
| int invert, struct xt_xlate *xl) |
| { |
| const char *op = invert ? "!= " : ""; |
| char addr_str[INET6_ADDRSTRLEN]; |
| int cidr; |
| |
| if (!invert && IN6_IS_ADDR_UNSPECIFIED(addr) && IN6_IS_ADDR_UNSPECIFIED(mask)) |
| return; |
| |
| inet_ntop(AF_INET6, addr, addr_str, INET6_ADDRSTRLEN); |
| cidr = xtables_ip6mask_to_cidr(mask); |
| switch (cidr) { |
| case -1: |
| xt_xlate_add(xl, "%s & %s %s %s ", selector, |
| xtables_ip6addr_to_numeric(mask), |
| invert ? "!=" : "==", addr_str); |
| break; |
| case 128: |
| xt_xlate_add(xl, "%s %s%s ", selector, op, addr_str); |
| break; |
| default: |
| xt_xlate_add(xl, "%s %s%s/%d ", selector, op, addr_str, cidr); |
| } |
| } |
| |
| static int nft_ipv6_xlate(const struct iptables_command_state *cs, |
| struct xt_xlate *xl) |
| { |
| const char *comment; |
| int ret; |
| |
| xlate_ifname(xl, "iifname", cs->fw6.ipv6.iniface, |
| cs->fw6.ipv6.invflags & IP6T_INV_VIA_IN); |
| xlate_ifname(xl, "oifname", cs->fw6.ipv6.outiface, |
| cs->fw6.ipv6.invflags & IP6T_INV_VIA_OUT); |
| |
| if (cs->fw6.ipv6.proto != 0) { |
| const struct protoent *pent = |
| getprotobynumber(cs->fw6.ipv6.proto); |
| char protonum[sizeof("65535")]; |
| const char *name = protonum; |
| |
| snprintf(protonum, sizeof(protonum), "%u", |
| cs->fw6.ipv6.proto); |
| |
| if (!pent || !xlate_find_match(cs, pent->p_name)) { |
| if (pent) |
| name = pent->p_name; |
| xt_xlate_add(xl, "meta l4proto %s%s ", |
| cs->fw6.ipv6.invflags & IP6T_INV_PROTO ? |
| "!= " : "", name); |
| } |
| |
| } |
| |
| xlate_ipv6_addr("ip6 saddr", &cs->fw6.ipv6.src, &cs->fw6.ipv6.smsk, |
| cs->fw6.ipv6.invflags & IP6T_INV_SRCIP, xl); |
| xlate_ipv6_addr("ip6 daddr", &cs->fw6.ipv6.dst, &cs->fw6.ipv6.dmsk, |
| cs->fw6.ipv6.invflags & IP6T_INV_DSTIP, xl); |
| |
| ret = xlate_matches(cs, xl); |
| if (!ret) |
| return ret; |
| |
| /* Always add counters per rule, as in iptables */ |
| xt_xlate_add(xl, "counter"); |
| ret = xlate_action(cs, !!(cs->fw6.ipv6.flags & IP6T_F_GOTO), xl); |
| |
| comment = xt_xlate_get_comment(xl); |
| if (comment) |
| xt_xlate_add(xl, " comment %s", comment); |
| |
| return ret; |
| } |
| |
| static int |
| nft_ipv6_add_entry(struct nft_handle *h, |
| const char *chain, const char *table, |
| struct iptables_command_state *cs, |
| struct xtables_args *args, bool verbose, |
| bool append, int rulenum) |
| { |
| unsigned int i, j; |
| int ret = 1; |
| |
| for (i = 0; i < args->s.naddrs; i++) { |
| memcpy(&cs->fw6.ipv6.src, |
| &args->s.addr.v6[i], sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.smsk, |
| &args->s.mask.v6[i], sizeof(struct in6_addr)); |
| for (j = 0; j < args->d.naddrs; j++) { |
| memcpy(&cs->fw6.ipv6.dst, |
| &args->d.addr.v6[j], sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.dmsk, |
| &args->d.mask.v6[j], sizeof(struct in6_addr)); |
| if (append) { |
| ret = nft_cmd_rule_append(h, chain, table, |
| cs, verbose); |
| } else { |
| ret = nft_cmd_rule_insert(h, chain, table, |
| cs, rulenum, verbose); |
| } |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int |
| nft_ipv6_delete_entry(struct nft_handle *h, |
| const char *chain, const char *table, |
| struct iptables_command_state *cs, |
| struct xtables_args *args, bool verbose) |
| { |
| unsigned int i, j; |
| int ret = 1; |
| |
| for (i = 0; i < args->s.naddrs; i++) { |
| memcpy(&cs->fw6.ipv6.src, |
| &args->s.addr.v6[i], sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.smsk, |
| &args->s.mask.v6[i], sizeof(struct in6_addr)); |
| for (j = 0; j < args->d.naddrs; j++) { |
| memcpy(&cs->fw6.ipv6.dst, |
| &args->d.addr.v6[j], sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.dmsk, |
| &args->d.mask.v6[j], sizeof(struct in6_addr)); |
| ret = nft_cmd_rule_delete(h, chain, table, cs, verbose); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int |
| nft_ipv6_check_entry(struct nft_handle *h, |
| const char *chain, const char *table, |
| struct iptables_command_state *cs, |
| struct xtables_args *args, bool verbose) |
| { |
| unsigned int i, j; |
| int ret = 1; |
| |
| for (i = 0; i < args->s.naddrs; i++) { |
| memcpy(&cs->fw6.ipv6.src, |
| &args->s.addr.v6[i], sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.smsk, |
| &args->s.mask.v6[i], sizeof(struct in6_addr)); |
| for (j = 0; j < args->d.naddrs; j++) { |
| memcpy(&cs->fw6.ipv6.dst, |
| &args->d.addr.v6[j], sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.dmsk, |
| &args->d.mask.v6[j], sizeof(struct in6_addr)); |
| ret = nft_cmd_rule_check(h, chain, table, cs, verbose); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int |
| nft_ipv6_replace_entry(struct nft_handle *h, |
| const char *chain, const char *table, |
| struct iptables_command_state *cs, |
| struct xtables_args *args, bool verbose, |
| int rulenum) |
| { |
| memcpy(&cs->fw6.ipv6.src, args->s.addr.v6, sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.dst, args->d.addr.v6, sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.smsk, args->s.mask.v6, sizeof(struct in6_addr)); |
| memcpy(&cs->fw6.ipv6.dmsk, args->d.mask.v6, sizeof(struct in6_addr)); |
| |
| return nft_cmd_rule_replace(h, chain, table, cs, rulenum, verbose); |
| } |
| |
| static struct nft_ruleparse_ops nft_ruleparse_ops_ipv6 = { |
| .meta = nft_ipv6_parse_meta, |
| .payload = nft_ipv6_parse_payload, |
| .target = nft_ipv46_parse_target, |
| }; |
| |
| struct nft_family_ops nft_family_ops_ipv6 = { |
| .add = nft_ipv6_add, |
| .is_same = nft_ipv6_is_same, |
| .set_goto_flag = nft_ipv6_set_goto_flag, |
| .print_header = print_header, |
| .print_rule = nft_ipv6_print_rule, |
| .save_rule = nft_ipv6_save_rule, |
| .save_chain = nft_ipv46_save_chain, |
| .rule_parse = &nft_ruleparse_ops_ipv6, |
| .cmd_parse = { |
| .proto_parse = ipv6_proto_parse, |
| .post_parse = ipv6_post_parse, |
| }, |
| .rule_to_cs = nft_rule_to_iptables_command_state, |
| .clear_cs = xtables_clear_iptables_command_state, |
| .xlate = nft_ipv6_xlate, |
| .add_entry = nft_ipv6_add_entry, |
| .delete_entry = nft_ipv6_delete_entry, |
| .check_entry = nft_ipv6_check_entry, |
| .replace_entry = nft_ipv6_replace_entry, |
| }; |