static bool socket_mt6_v1(const struct sk_buff *skb, struct xt_action_param *par) { struct sock *sk; const struct xt_socket_mtinfo1 *info; info = (struct xt_socket_mtinfo1 *) par->matchinfo; sk = xt_socket_get6_sk(skb, par); if (sk != NULL) { bool wildcard; bool transparent = true; /* Ignore sockets listening on INADDR_ANY */ wildcard = (sk->sk_state != TCP_TIME_WAIT && ipv6_addr_any(&inet6_sk(sk)->rcv_saddr)); /* Ignore non-transparent sockets, if XT_SOCKET_TRANSPARENT is used */ if (info && info->flags & XT_SOCKET_TRANSPARENT) transparent = ((sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->transparent) || (sk->sk_state == TCP_TIME_WAIT && inet_twsk(sk)->tw_transparent)); xt_socket_put_sk(sk); if (wildcard || !transparent) sk = NULL; } return (sk != NULL); }
static bool socket_match(const struct sk_buff *skb, struct xt_action_param *par, const struct xt_socket_mtinfo1 *info) { struct sock *sk; sk = xt_socket_get4_sk(skb, par); if (sk != NULL) { bool wildcard; bool transparent = true; wildcard = (sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->inet_rcv_saddr == 0); if (info && info->flags & XT_SOCKET_TRANSPARENT) transparent = ((sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->transparent) || (sk->sk_state == TCP_TIME_WAIT && inet_twsk(sk)->tw_transparent)); xt_socket_put_sk(sk); if (wildcard || !transparent) sk = NULL; } return (sk != NULL); }
static bool socket_mt6_v1(const struct sk_buff *skb, struct xt_action_param *par) { struct ipv6hdr *iph = ipv6_hdr(skb); struct udphdr _hdr, *hp = NULL; struct sock *sk; struct in6_addr *daddr, *saddr; __be16 dport, sport; int thoff = 0, tproto; const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo; tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL); if (tproto < 0) { pr_debug("unable to find transport header in IPv6 packet, dropping\n"); return NF_DROP; } if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) { hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr); if (hp == NULL) return false; saddr = &iph->saddr; sport = hp->source; daddr = &iph->daddr; dport = hp->dest; } else if (tproto == IPPROTO_ICMPV6) { if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr, &sport, &dport)) return false; } else { return false; } sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto, saddr, daddr, sport, dport, par->in, NFT_LOOKUP_ANY); if (sk != NULL) { bool wildcard; bool transparent = true; /* Ignore sockets listening on INADDR_ANY */ wildcard = (sk->sk_state != TCP_TIME_WAIT && ipv6_addr_any(&inet6_sk(sk)->rcv_saddr)); /* Ignore non-transparent sockets, if XT_SOCKET_TRANSPARENT is used */ if (info && info->flags & XT_SOCKET_TRANSPARENT) transparent = ((sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->transparent) || (sk->sk_state == TCP_TIME_WAIT && inet_twsk(sk)->tw_transparent)); xt_socket_put_sk(sk); if (wildcard || !transparent) sk = NULL; } pr_debug("proto %hhd %pI6:%hu -> %pI6:%hu " "(orig %pI6:%hu) sock %p\n", tproto, saddr, ntohs(sport), daddr, ntohs(dport), &iph->daddr, hp ? ntohs(hp->dest) : 0, sk); return (sk != NULL); }
static bool socket_match(const struct sk_buff *skb, struct xt_action_param *par, const struct xt_socket_mtinfo1 *info) { const struct iphdr *iph = ip_hdr(skb); struct udphdr _hdr, *hp = NULL; struct sock *sk; __be32 daddr, saddr; __be16 dport, sport; u8 protocol; #ifdef XT_SOCKET_HAVE_CONNTRACK struct nf_conn const *ct; enum ip_conntrack_info ctinfo; #endif if (iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_TCP) { hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr); if (hp == NULL) return false; protocol = iph->protocol; saddr = iph->saddr; sport = hp->source; daddr = iph->daddr; dport = hp->dest; } else if (iph->protocol == IPPROTO_ICMP) { if (extract_icmp4_fields(skb, &protocol, &saddr, &daddr, &sport, &dport)) return false; } else { return false; } #ifdef XT_SOCKET_HAVE_CONNTRACK /* Do the lookup with the original socket address in case this is a * reply packet of an established SNAT-ted connection. */ ct = nf_ct_get(skb, &ctinfo); if (ct && !nf_ct_is_untracked(ct) && ((iph->protocol != IPPROTO_ICMP && ctinfo == IP_CT_ESTABLISHED_REPLY) || (iph->protocol == IPPROTO_ICMP && ctinfo == IP_CT_RELATED_REPLY)) && (ct->status & IPS_SRC_NAT_DONE)) { daddr = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip; dport = (iph->protocol == IPPROTO_TCP) ? ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.tcp.port : ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port; } #endif sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), protocol, saddr, daddr, sport, dport, par->in, NFT_LOOKUP_ANY); if (sk != NULL) { bool wildcard; bool transparent = true; /* Ignore sockets listening on INADDR_ANY */ wildcard = (sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->inet_rcv_saddr == 0); /* Ignore non-transparent sockets, if XT_SOCKET_TRANSPARENT is used */ if (info && info->flags & XT_SOCKET_TRANSPARENT) transparent = ((sk->sk_state != TCP_TIME_WAIT && inet_sk(sk)->transparent) || (sk->sk_state == TCP_TIME_WAIT && inet_twsk(sk)->tw_transparent)); xt_socket_put_sk(sk); if (wildcard || !transparent) sk = NULL; } pr_debug("proto %hhu %pI4:%hu -> %pI4:%hu (orig %pI4:%hu) sock %p\n", protocol, &saddr, ntohs(sport), &daddr, ntohs(dport), &iph->daddr, hp ? ntohs(hp->dest) : 0, sk); return (sk != NULL); }