| /* |
| * (C) 2012-2013 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 <stdlib.h> |
| #include <stdbool.h> |
| #include <netdb.h> |
| #include <errno.h> |
| |
| #include <xtables.h> |
| |
| #include <linux/netfilter/nf_tables.h> |
| |
| #include <libmnl/libmnl.h> |
| #include <libnftnl/rule.h> |
| #include <libnftnl/expr.h> |
| |
| #include "nft-shared.h" |
| #include "nft-bridge.h" |
| #include "xshared.h" |
| #include "nft.h" |
| |
| extern struct nft_family_ops nft_family_ops_ipv4; |
| extern struct nft_family_ops nft_family_ops_ipv6; |
| extern struct nft_family_ops nft_family_ops_arp; |
| extern struct nft_family_ops nft_family_ops_bridge; |
| |
| void add_meta(struct nftnl_rule *r, uint32_t key) |
| { |
| struct nftnl_expr *expr; |
| |
| expr = nftnl_expr_alloc("meta"); |
| if (expr == NULL) |
| return; |
| |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_META_KEY, key); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_META_DREG, NFT_REG_1); |
| |
| nftnl_rule_add_expr(r, expr); |
| } |
| |
| void add_payload(struct nftnl_rule *r, int offset, int len, uint32_t base) |
| { |
| struct nftnl_expr *expr; |
| |
| expr = nftnl_expr_alloc("payload"); |
| if (expr == NULL) |
| return; |
| |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_PAYLOAD_BASE, base); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_PAYLOAD_DREG, NFT_REG_1); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_PAYLOAD_OFFSET, offset); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_PAYLOAD_LEN, len); |
| |
| nftnl_rule_add_expr(r, expr); |
| } |
| |
| /* bitwise operation is = sreg & mask ^ xor */ |
| void add_bitwise_u16(struct nftnl_rule *r, int mask, int xor) |
| { |
| struct nftnl_expr *expr; |
| |
| expr = nftnl_expr_alloc("bitwise"); |
| if (expr == NULL) |
| return; |
| |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_BITWISE_SREG, NFT_REG_1); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_BITWISE_DREG, NFT_REG_1); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_BITWISE_LEN, sizeof(uint16_t)); |
| nftnl_expr_set(expr, NFTNL_EXPR_BITWISE_MASK, &mask, sizeof(uint16_t)); |
| nftnl_expr_set(expr, NFTNL_EXPR_BITWISE_XOR, &xor, sizeof(uint16_t)); |
| |
| nftnl_rule_add_expr(r, expr); |
| } |
| |
| static void add_bitwise(struct nftnl_rule *r, uint8_t *mask, size_t len) |
| { |
| struct nftnl_expr *expr; |
| uint32_t xor[4] = { 0 }; |
| |
| expr = nftnl_expr_alloc("bitwise"); |
| if (expr == NULL) |
| return; |
| |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_BITWISE_SREG, NFT_REG_1); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_BITWISE_DREG, NFT_REG_1); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_BITWISE_LEN, len); |
| nftnl_expr_set(expr, NFTNL_EXPR_BITWISE_MASK, mask, len); |
| nftnl_expr_set(expr, NFTNL_EXPR_BITWISE_XOR, &xor, len); |
| |
| nftnl_rule_add_expr(r, expr); |
| } |
| |
| void add_cmp_ptr(struct nftnl_rule *r, uint32_t op, void *data, size_t len) |
| { |
| struct nftnl_expr *expr; |
| |
| expr = nftnl_expr_alloc("cmp"); |
| if (expr == NULL) |
| return; |
| |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_CMP_SREG, NFT_REG_1); |
| nftnl_expr_set_u32(expr, NFTNL_EXPR_CMP_OP, op); |
| nftnl_expr_set(expr, NFTNL_EXPR_CMP_DATA, data, len); |
| |
| nftnl_rule_add_expr(r, expr); |
| } |
| |
| void add_cmp_u8(struct nftnl_rule *r, uint8_t val, uint32_t op) |
| { |
| add_cmp_ptr(r, op, &val, sizeof(val)); |
| } |
| |
| void add_cmp_u16(struct nftnl_rule *r, uint16_t val, uint32_t op) |
| { |
| add_cmp_ptr(r, op, &val, sizeof(val)); |
| } |
| |
| void add_cmp_u32(struct nftnl_rule *r, uint32_t val, uint32_t op) |
| { |
| add_cmp_ptr(r, op, &val, sizeof(val)); |
| } |
| |
| void add_iniface(struct nftnl_rule *r, char *iface, uint32_t op) |
| { |
| int iface_len; |
| |
| iface_len = strlen(iface); |
| |
| add_meta(r, NFT_META_IIFNAME); |
| if (iface[iface_len - 1] == '+') |
| add_cmp_ptr(r, op, iface, iface_len - 1); |
| else |
| add_cmp_ptr(r, op, iface, iface_len + 1); |
| } |
| |
| void add_outiface(struct nftnl_rule *r, char *iface, uint32_t op) |
| { |
| int iface_len; |
| |
| iface_len = strlen(iface); |
| |
| add_meta(r, NFT_META_OIFNAME); |
| if (iface[iface_len - 1] == '+') |
| add_cmp_ptr(r, op, iface, iface_len - 1); |
| else |
| add_cmp_ptr(r, op, iface, iface_len + 1); |
| } |
| |
| void add_addr(struct nftnl_rule *r, int offset, |
| void *data, void *mask, size_t len, uint32_t op) |
| { |
| add_payload(r, offset, len, NFT_PAYLOAD_NETWORK_HEADER); |
| add_bitwise(r, mask, len); |
| |
| add_cmp_ptr(r, op, data, len); |
| } |
| |
| void add_proto(struct nftnl_rule *r, int offset, size_t len, |
| uint8_t proto, uint32_t op) |
| { |
| add_payload(r, offset, len, NFT_PAYLOAD_NETWORK_HEADER); |
| add_cmp_u8(r, proto, op); |
| } |
| |
| bool is_same_interfaces(const char *a_iniface, const char *a_outiface, |
| unsigned const char *a_iniface_mask, |
| unsigned const char *a_outiface_mask, |
| const char *b_iniface, const char *b_outiface, |
| unsigned const char *b_iniface_mask, |
| unsigned const char *b_outiface_mask) |
| { |
| int i; |
| |
| for (i = 0; i < IFNAMSIZ; i++) { |
| if (a_iniface_mask[i] != b_iniface_mask[i]) { |
| DEBUGP("different iniface mask %x, %x (%d)\n", |
| a_iniface_mask[i] & 0xff, b_iniface_mask[i] & 0xff, i); |
| return false; |
| } |
| if ((a_iniface[i] & a_iniface_mask[i]) |
| != (b_iniface[i] & b_iniface_mask[i])) { |
| DEBUGP("different iniface\n"); |
| return false; |
| } |
| if (a_outiface_mask[i] != b_outiface_mask[i]) { |
| DEBUGP("different outiface mask\n"); |
| return false; |
| } |
| if ((a_outiface[i] & a_outiface_mask[i]) |
| != (b_outiface[i] & b_outiface_mask[i])) { |
| DEBUGP("different outiface\n"); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| int parse_meta(struct nftnl_expr *e, uint8_t key, char *iniface, |
| unsigned char *iniface_mask, char *outiface, |
| unsigned char *outiface_mask, uint8_t *invflags) |
| { |
| uint32_t value; |
| const void *ifname; |
| uint32_t len; |
| |
| switch(key) { |
| case NFT_META_IIF: |
| value = nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_DATA); |
| if (nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP) == NFT_CMP_NEQ) |
| *invflags |= IPT_INV_VIA_IN; |
| |
| if_indextoname(value, iniface); |
| |
| memset(iniface_mask, 0xff, strlen(iniface)+1); |
| break; |
| case NFT_META_OIF: |
| value = nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_DATA); |
| if (nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP) == NFT_CMP_NEQ) |
| *invflags |= IPT_INV_VIA_OUT; |
| |
| if_indextoname(value, outiface); |
| |
| memset(outiface_mask, 0xff, strlen(outiface)+1); |
| break; |
| case NFT_META_IIFNAME: |
| ifname = nftnl_expr_get(e, NFTNL_EXPR_CMP_DATA, &len); |
| if (nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP) == NFT_CMP_NEQ) |
| *invflags |= IPT_INV_VIA_IN; |
| |
| memcpy(iniface, ifname, len); |
| |
| if (iniface[len] == '\0') |
| memset(iniface_mask, 0xff, len); |
| else { |
| iniface[len] = '+'; |
| iniface[len+1] = '\0'; |
| memset(iniface_mask, 0xff, len + 1); |
| } |
| break; |
| case NFT_META_OIFNAME: |
| ifname = nftnl_expr_get(e, NFTNL_EXPR_CMP_DATA, &len); |
| if (nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP) == NFT_CMP_NEQ) |
| *invflags |= IPT_INV_VIA_OUT; |
| |
| memcpy(outiface, ifname, len); |
| |
| if (outiface[len] == '\0') |
| memset(outiface_mask, 0xff, len); |
| else { |
| outiface[len] = '+'; |
| outiface[len+1] = '\0'; |
| memset(outiface_mask, 0xff, len + 1); |
| } |
| break; |
| default: |
| return -1; |
| } |
| |
| return 0; |
| } |
| |
| static void *nft_get_data(struct nft_xt_ctx *ctx) |
| { |
| switch(ctx->family) { |
| case NFPROTO_IPV4: |
| case NFPROTO_IPV6: |
| return ctx->state.cs; |
| case NFPROTO_ARP: |
| return ctx->state.cs_arp; |
| case NFPROTO_BRIDGE: |
| return ctx->state.cs_eb; |
| default: |
| /* Should not happen */ |
| return NULL; |
| } |
| } |
| |
| void nft_parse_target(struct nft_xt_ctx *ctx, struct nftnl_expr *e) |
| { |
| uint32_t tg_len; |
| const char *targname = nftnl_expr_get_str(e, NFTNL_EXPR_TG_NAME); |
| const void *targinfo = nftnl_expr_get(e, NFTNL_EXPR_TG_INFO, &tg_len); |
| struct xtables_target *target; |
| struct xt_entry_target *t; |
| size_t size; |
| struct nft_family_ops *ops; |
| void *data = nft_get_data(ctx); |
| |
| target = xtables_find_target(targname, XTF_TRY_LOAD); |
| if (target == NULL) |
| return; |
| |
| size = XT_ALIGN(sizeof(struct xt_entry_target)) + tg_len; |
| |
| t = calloc(1, size); |
| if (t == NULL) { |
| fprintf(stderr, "OOM"); |
| exit(EXIT_FAILURE); |
| } |
| memcpy(&t->data, targinfo, tg_len); |
| t->u.target_size = size; |
| t->u.user.revision = nftnl_expr_get_u32(e, NFTNL_EXPR_TG_REV); |
| strcpy(t->u.user.name, target->name); |
| |
| target->t = t; |
| |
| ops = nft_family_ops_lookup(ctx->family); |
| ops->parse_target(target, data); |
| } |
| |
| void nft_parse_match(struct nft_xt_ctx *ctx, struct nftnl_expr *e) |
| { |
| uint32_t mt_len; |
| const char *mt_name = nftnl_expr_get_str(e, NFTNL_EXPR_MT_NAME); |
| const void *mt_info = nftnl_expr_get(e, NFTNL_EXPR_MT_INFO, &mt_len); |
| struct xtables_match *match; |
| struct xtables_rule_match **matches; |
| struct xt_entry_match *m; |
| struct nft_family_ops *ops; |
| |
| switch (ctx->family) { |
| case NFPROTO_IPV4: |
| case NFPROTO_IPV6: |
| matches = &ctx->state.cs->matches; |
| break; |
| case NFPROTO_BRIDGE: |
| matches = &ctx->state.cs_eb->matches; |
| break; |
| default: |
| fprintf(stderr, "BUG: nft_parse_match() unknown family %d\n", |
| ctx->family); |
| exit(EXIT_FAILURE); |
| } |
| |
| match = xtables_find_match(mt_name, XTF_TRY_LOAD, matches); |
| if (match == NULL) |
| return; |
| |
| m = calloc(1, sizeof(struct xt_entry_match) + mt_len); |
| if (m == NULL) { |
| fprintf(stderr, "OOM"); |
| exit(EXIT_FAILURE); |
| } |
| |
| memcpy(&m->data, mt_info, mt_len); |
| m->u.match_size = mt_len + XT_ALIGN(sizeof(struct xt_entry_match)); |
| m->u.user.revision = nftnl_expr_get_u32(e, NFTNL_EXPR_TG_REV); |
| strcpy(m->u.user.name, match->name); |
| |
| match->m = m; |
| |
| ops = nft_family_ops_lookup(ctx->family); |
| if (ops->parse_match != NULL) |
| ops->parse_match(match, nft_get_data(ctx)); |
| } |
| |
| void print_proto(uint16_t proto, int invert) |
| { |
| const struct protoent *pent = getprotobynumber(proto); |
| |
| if (invert) |
| printf("! "); |
| |
| if (pent) { |
| printf("-p %s ", pent->p_name); |
| return; |
| } |
| |
| printf("-p %u ", proto); |
| } |
| |
| void get_cmp_data(struct nftnl_expr *e, void *data, size_t dlen, bool *inv) |
| { |
| uint32_t len; |
| uint8_t op; |
| |
| memcpy(data, nftnl_expr_get(e, NFTNL_EXPR_CMP_DATA, &len), dlen); |
| op = nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP); |
| if (op == NFT_CMP_NEQ) |
| *inv = true; |
| else |
| *inv = false; |
| } |
| |
| void nft_parse_meta(struct nft_xt_ctx *ctx, struct nftnl_expr *e) |
| { |
| ctx->reg = nftnl_expr_get_u32(e, NFTNL_EXPR_META_DREG); |
| ctx->meta.key = nftnl_expr_get_u32(e, NFTNL_EXPR_META_KEY); |
| ctx->flags |= NFT_XT_CTX_META; |
| } |
| |
| void nft_parse_payload(struct nft_xt_ctx *ctx, struct nftnl_expr *e) |
| { |
| ctx->reg = nftnl_expr_get_u32(e, NFTNL_EXPR_META_DREG); |
| ctx->payload.offset = nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_OFFSET); |
| ctx->flags |= NFT_XT_CTX_PAYLOAD; |
| } |
| |
| void nft_parse_bitwise(struct nft_xt_ctx *ctx, struct nftnl_expr *e) |
| { |
| uint32_t reg, len; |
| const void *data; |
| |
| reg = nftnl_expr_get_u32(e, NFTNL_EXPR_BITWISE_SREG); |
| if (ctx->reg && reg != ctx->reg) |
| return; |
| |
| data = nftnl_expr_get(e, NFTNL_EXPR_BITWISE_XOR, &len); |
| memcpy(ctx->bitwise.xor, data, len); |
| data = nftnl_expr_get(e, NFTNL_EXPR_BITWISE_MASK, &len); |
| memcpy(ctx->bitwise.mask, data, len); |
| ctx->flags |= NFT_XT_CTX_BITWISE; |
| } |
| |
| void nft_parse_cmp(struct nft_xt_ctx *ctx, struct nftnl_expr *e) |
| { |
| struct nft_family_ops *ops = nft_family_ops_lookup(ctx->family); |
| void *data = nft_get_data(ctx); |
| uint32_t reg; |
| |
| reg = nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_SREG); |
| if (ctx->reg && reg != ctx->reg) |
| return; |
| |
| if (ctx->flags & NFT_XT_CTX_META) { |
| ops->parse_meta(ctx, e, data); |
| ctx->flags &= ~NFT_XT_CTX_META; |
| } |
| /* bitwise context is interpreted from payload */ |
| if (ctx->flags & NFT_XT_CTX_PAYLOAD) { |
| ops->parse_payload(ctx, e, data); |
| ctx->flags &= ~NFT_XT_CTX_PAYLOAD; |
| } |
| } |
| |
| void nft_parse_counter(struct nftnl_expr *e, struct xt_counters *counters) |
| { |
| counters->pcnt = nftnl_expr_get_u64(e, NFTNL_EXPR_CTR_PACKETS); |
| counters->bcnt = nftnl_expr_get_u64(e, NFTNL_EXPR_CTR_BYTES); |
| } |
| |
| void nft_parse_immediate(struct nft_xt_ctx *ctx, struct nftnl_expr *e) |
| { |
| int verdict = nftnl_expr_get_u32(e, NFTNL_EXPR_IMM_VERDICT); |
| const char *chain = nftnl_expr_get_str(e, NFTNL_EXPR_IMM_CHAIN); |
| struct nft_family_ops *ops; |
| const char *jumpto = NULL; |
| bool nft_goto = false; |
| void *data = nft_get_data(ctx); |
| |
| /* Standard target? */ |
| switch(verdict) { |
| case NF_ACCEPT: |
| jumpto = "ACCEPT"; |
| break; |
| case NF_DROP: |
| jumpto = "DROP"; |
| break; |
| case NFT_RETURN: |
| jumpto = "RETURN"; |
| break;; |
| case NFT_GOTO: |
| nft_goto = true; |
| case NFT_JUMP: |
| jumpto = chain; |
| break; |
| } |
| |
| ops = nft_family_ops_lookup(ctx->family); |
| ops->parse_immediate(jumpto, nft_goto, data); |
| } |
| |
| void nft_rule_to_iptables_command_state(struct nftnl_rule *r, |
| struct iptables_command_state *cs) |
| { |
| struct nftnl_expr_iter *iter; |
| struct nftnl_expr *expr; |
| int family = nftnl_rule_get_u32(r, NFTNL_RULE_FAMILY); |
| struct nft_xt_ctx ctx = { |
| .state.cs = cs, |
| .family = family, |
| }; |
| |
| iter = nftnl_expr_iter_create(r); |
| if (iter == NULL) |
| return; |
| |
| ctx.iter = iter; |
| expr = nftnl_expr_iter_next(iter); |
| while (expr != NULL) { |
| const char *name = |
| nftnl_expr_get_str(expr, NFTNL_EXPR_NAME); |
| |
| if (strcmp(name, "counter") == 0) |
| nft_parse_counter(expr, &ctx.state.cs->counters); |
| else if (strcmp(name, "payload") == 0) |
| nft_parse_payload(&ctx, expr); |
| else if (strcmp(name, "meta") == 0) |
| nft_parse_meta(&ctx, expr); |
| else if (strcmp(name, "bitwise") == 0) |
| nft_parse_bitwise(&ctx, expr); |
| else if (strcmp(name, "cmp") == 0) |
| nft_parse_cmp(&ctx, expr); |
| else if (strcmp(name, "immediate") == 0) |
| nft_parse_immediate(&ctx, expr); |
| else if (strcmp(name, "match") == 0) |
| nft_parse_match(&ctx, expr); |
| else if (strcmp(name, "target") == 0) |
| nft_parse_target(&ctx, expr); |
| |
| expr = nftnl_expr_iter_next(iter); |
| } |
| |
| nftnl_expr_iter_destroy(iter); |
| |
| if (nftnl_rule_is_set(r, NFTNL_RULE_USERDATA)) { |
| const void *data; |
| uint32_t len; |
| struct xtables_match *match; |
| struct xt_entry_match *m; |
| |
| data = nftnl_rule_get_data(r, NFTNL_RULE_USERDATA, &len); |
| match = xtables_find_match("comment", XTF_TRY_LOAD, |
| &cs->matches); |
| if (match == NULL) |
| return; |
| |
| m = calloc(1, sizeof(struct xt_entry_match) + len); |
| if (m == NULL) { |
| fprintf(stderr, "OOM"); |
| exit(EXIT_FAILURE); |
| } |
| |
| memcpy(&m->data, get_comment(data, len), len); |
| m->u.match_size = len + XT_ALIGN(sizeof(struct xt_entry_match)); |
| m->u.user.revision = 0; |
| strcpy(m->u.user.name, match->name); |
| |
| match->m = m; |
| } |
| |
| if (cs->target != NULL) |
| cs->jumpto = cs->target->name; |
| else if (cs->jumpto != NULL) |
| cs->target = xtables_find_target(cs->jumpto, XTF_TRY_LOAD); |
| else |
| cs->jumpto = ""; |
| } |
| |
| void print_header(unsigned int format, const char *chain, const char *pol, |
| const struct xt_counters *counters, bool basechain, |
| uint32_t refs) |
| { |
| printf("Chain %s", chain); |
| if (basechain) { |
| printf(" (policy %s", pol); |
| if (!(format & FMT_NOCOUNTS)) { |
| fputc(' ', stdout); |
| xtables_print_num(counters->pcnt, (format|FMT_NOTABLE)); |
| fputs("packets, ", stdout); |
| xtables_print_num(counters->bcnt, (format|FMT_NOTABLE)); |
| fputs("bytes", stdout); |
| } |
| printf(")\n"); |
| } else { |
| printf(" (%u references)\n", refs); |
| } |
| |
| if (format & FMT_LINENUMBERS) |
| printf(FMT("%-4s ", "%s "), "num"); |
| if (!(format & FMT_NOCOUNTS)) { |
| if (format & FMT_KILOMEGAGIGA) { |
| printf(FMT("%5s ","%s "), "pkts"); |
| printf(FMT("%5s ","%s "), "bytes"); |
| } else { |
| printf(FMT("%8s ","%s "), "pkts"); |
| printf(FMT("%10s ","%s "), "bytes"); |
| } |
| } |
| if (!(format & FMT_NOTARGET)) |
| printf(FMT("%-9s ","%s "), "target"); |
| fputs(" prot ", stdout); |
| if (format & FMT_OPTIONS) |
| fputs("opt", stdout); |
| if (format & FMT_VIA) { |
| printf(FMT(" %-6s ","%s "), "in"); |
| printf(FMT("%-6s ","%s "), "out"); |
| } |
| printf(FMT(" %-19s ","%s "), "source"); |
| printf(FMT(" %-19s "," %s "), "destination"); |
| printf("\n"); |
| } |
| |
| void print_firewall_details(const struct iptables_command_state *cs, |
| const char *targname, uint8_t flags, |
| uint8_t invflags, uint8_t proto, |
| unsigned int num, unsigned int format) |
| { |
| if (format & FMT_LINENUMBERS) |
| printf(FMT("%-4u ", "%u "), num); |
| |
| if (!(format & FMT_NOCOUNTS)) { |
| xtables_print_num(cs->counters.pcnt, format); |
| xtables_print_num(cs->counters.bcnt, format); |
| } |
| |
| if (!(format & FMT_NOTARGET)) |
| printf(FMT("%-9s ", "%s "), targname ? targname : ""); |
| |
| fputc(invflags & XT_INV_PROTO ? '!' : ' ', stdout); |
| { |
| const char *pname = |
| proto_to_name(proto, format&FMT_NUMERIC); |
| if (pname) |
| printf(FMT("%-5s", "%s "), pname); |
| else |
| printf(FMT("%-5hu", "%hu "), proto); |
| } |
| } |
| |
| void print_ifaces(const char *iniface, const char *outiface, uint8_t invflags, |
| unsigned int format) |
| { |
| char iface[IFNAMSIZ+2]; |
| |
| if (!(format & FMT_VIA)) |
| return; |
| |
| if (invflags & IPT_INV_VIA_IN) { |
| iface[0] = '!'; |
| iface[1] = '\0'; |
| } else |
| iface[0] = '\0'; |
| |
| if (iniface[0] != '\0') |
| strcat(iface, iniface); |
| else if (format & FMT_NUMERIC) |
| strcat(iface, "*"); |
| else |
| strcat(iface, "any"); |
| |
| printf(FMT(" %-6s ","in %s "), iface); |
| |
| if (invflags & IPT_INV_VIA_OUT) { |
| iface[0] = '!'; |
| iface[1] = '\0'; |
| } else |
| iface[0] = '\0'; |
| |
| if (outiface[0] != '\0') |
| strcat(iface, outiface); |
| else if (format & FMT_NUMERIC) |
| strcat(iface, "*"); |
| else |
| strcat(iface, "any"); |
| |
| printf(FMT("%-6s ","out %s "), iface); |
| } |
| |
| static void |
| print_iface(char letter, const char *iface, const unsigned char *mask, int inv) |
| { |
| unsigned int i; |
| |
| if (mask[0] == 0) |
| return; |
| |
| printf("%s-%c ", inv ? "! " : "", letter); |
| |
| for (i = 0; i < IFNAMSIZ; i++) { |
| if (mask[i] != 0) { |
| if (iface[i] != '\0') |
| printf("%c", iface[i]); |
| } else { |
| if (iface[i-1] != '\0') |
| printf("+"); |
| break; |
| } |
| } |
| |
| printf(" "); |
| } |
| |
| void save_firewall_details(const struct iptables_command_state *cs, |
| uint8_t invflags, uint16_t proto, |
| const char *iniface, |
| unsigned const char *iniface_mask, |
| const char *outiface, |
| unsigned const char *outiface_mask) |
| { |
| if (iniface != NULL) { |
| print_iface('i', iniface, iniface_mask, |
| invflags & IPT_INV_VIA_IN); |
| } |
| if (outiface != NULL) { |
| print_iface('o', outiface, outiface_mask, |
| invflags & IPT_INV_VIA_OUT); |
| } |
| |
| if (proto > 0) { |
| const struct protoent *pent = getprotobynumber(proto); |
| |
| if (invflags & XT_INV_PROTO) |
| printf("! "); |
| |
| if (pent) |
| printf("-p %s ", pent->p_name); |
| else |
| printf("-p %u ", proto); |
| } |
| } |
| |
| void save_counters(uint64_t pcnt, uint64_t bcnt) |
| { |
| printf("[%llu:%llu] ", (unsigned long long)pcnt, |
| (unsigned long long)bcnt); |
| } |
| |
| void save_matches_and_target(struct xtables_rule_match *m, |
| struct xtables_target *target, |
| const char *jumpto, uint8_t flags, const void *fw) |
| { |
| struct xtables_rule_match *matchp; |
| |
| for (matchp = m; matchp; matchp = matchp->next) { |
| if (matchp->match->alias) { |
| printf("-m %s", |
| matchp->match->alias(matchp->match->m)); |
| } else |
| printf("-m %s", matchp->match->name); |
| |
| if (matchp->match->save != NULL) { |
| /* cs->fw union makes the trick */ |
| matchp->match->save(fw, matchp->match->m); |
| } |
| printf(" "); |
| } |
| |
| if (target != NULL) { |
| if (target->alias) { |
| printf("-j %s", target->alias(target->t)); |
| } else |
| printf("-j %s", jumpto); |
| |
| if (target->save != NULL) |
| target->save(fw, target->t); |
| } |
| } |
| |
| void print_matches_and_target(struct iptables_command_state *cs, |
| unsigned int format) |
| { |
| struct xtables_rule_match *matchp; |
| |
| for (matchp = cs->matches; matchp; matchp = matchp->next) { |
| if (matchp->match->print != NULL) { |
| matchp->match->print(&cs->fw, matchp->match->m, |
| format & FMT_NUMERIC); |
| } |
| } |
| |
| if (cs->target != NULL) { |
| if (cs->target->print != NULL) { |
| cs->target->print(&cs->fw, cs->target->t, |
| format & FMT_NUMERIC); |
| } |
| } |
| } |
| |
| struct nft_family_ops *nft_family_ops_lookup(int family) |
| { |
| switch (family) { |
| case AF_INET: |
| return &nft_family_ops_ipv4; |
| case AF_INET6: |
| return &nft_family_ops_ipv6; |
| case NFPROTO_ARP: |
| return &nft_family_ops_arp; |
| case NFPROTO_BRIDGE: |
| return &nft_family_ops_bridge; |
| default: |
| break; |
| } |
| |
| return NULL; |
| } |
| |
| bool compare_matches(struct xtables_rule_match *mt1, |
| struct xtables_rule_match *mt2) |
| { |
| struct xtables_rule_match *mp1; |
| struct xtables_rule_match *mp2; |
| |
| for (mp1 = mt1, mp2 = mt2; mp1 && mp2; mp1 = mp1->next, mp2 = mp2->next) { |
| struct xt_entry_match *m1 = mp1->match->m; |
| struct xt_entry_match *m2 = mp2->match->m; |
| |
| if (strcmp(m1->u.user.name, m2->u.user.name) != 0) { |
| DEBUGP("mismatching match name\n"); |
| return false; |
| } |
| |
| if (m1->u.user.match_size != m2->u.user.match_size) { |
| DEBUGP("mismatching match size\n"); |
| return false; |
| } |
| |
| if (memcmp(m1->data, m2->data, |
| mp1->match->userspacesize) != 0) { |
| DEBUGP("mismatch match data\n"); |
| return false; |
| } |
| } |
| |
| /* Both cursors should be NULL */ |
| if (mp1 != mp2) { |
| DEBUGP("mismatch matches amount\n"); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| bool compare_targets(struct xtables_target *tg1, struct xtables_target *tg2) |
| { |
| if (tg1 == NULL && tg2 == NULL) |
| return true; |
| |
| if ((tg1 == NULL && tg2 != NULL) || (tg1 != NULL && tg2 == NULL)) |
| return false; |
| |
| if (strcmp(tg1->t->u.user.name, tg2->t->u.user.name) != 0) |
| return false; |
| |
| if (memcmp(tg1->t->data, tg2->t->data, tg1->userspacesize) != 0) |
| return false; |
| |
| return true; |
| } |
| |
| bool nft_ipv46_rule_find(struct nft_family_ops *ops, |
| struct nftnl_rule *r, struct iptables_command_state *cs) |
| { |
| struct iptables_command_state this = {}; |
| |
| nft_rule_to_iptables_command_state(r, &this); |
| |
| DEBUGP("comparing with... "); |
| #ifdef DEBUG_DEL |
| nft_rule_print_save(&this, r, NFT_RULE_APPEND, 0); |
| #endif |
| if (!ops->is_same(cs, &this)) |
| return false; |
| |
| if (!compare_matches(cs->matches, this.matches)) { |
| DEBUGP("Different matches\n"); |
| return false; |
| } |
| |
| if (!compare_targets(cs->target, this.target)) { |
| DEBUGP("Different target\n"); |
| return false; |
| } |
| |
| if (strcmp(cs->jumpto, this.jumpto) != 0) { |
| DEBUGP("Different verdict\n"); |
| return false; |
| } |
| |
| return true; |
| } |