int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); struct in6_addr *daddr, old_daddr; __be32 fl6_flowlabel = 0; __be32 old_fl6_flowlabel; __be16 old_dport; int addr_type; int err; if (usin->sin6_family == AF_INET) { if (__ipv6_only_sock(sk)) return -EAFNOSUPPORT; err = __ip4_datagram_connect(sk, uaddr, addr_len); goto ipv4_connected; } if (addr_len < SIN6_LEN_RFC2133) return -EINVAL; if (usin->sin6_family != AF_INET6) return -EAFNOSUPPORT; if (np->sndflow) fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; if (ipv6_addr_any(&usin->sin6_addr)) { /* * connect to self */ if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), &usin->sin6_addr); else usin->sin6_addr = in6addr_loopback; } addr_type = ipv6_addr_type(&usin->sin6_addr); daddr = &usin->sin6_addr; if (addr_type & IPV6_ADDR_MAPPED) { struct sockaddr_in sin; if (__ipv6_only_sock(sk)) { err = -ENETUNREACH; goto out; } sin.sin_family = AF_INET; sin.sin_addr.s_addr = daddr->s6_addr32[3]; sin.sin_port = usin->sin6_port; err = __ip4_datagram_connect(sk, (struct sockaddr *) &sin, sizeof(sin)); ipv4_connected: if (err) goto out; ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); if (ipv6_addr_any(&np->saddr) || ipv6_mapped_addr_any(&np->saddr)) ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr); if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } goto out; } if (__ipv6_addr_needs_scope_id(addr_type)) { if (addr_len >= sizeof(struct sockaddr_in6) && usin->sin6_scope_id) { if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) { err = -EINVAL; goto out; } sk->sk_bound_dev_if = usin->sin6_scope_id; } if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) sk->sk_bound_dev_if = np->mcast_oif; /* Connect to link-local address requires an interface */ if (!sk->sk_bound_dev_if) { err = -EINVAL; goto out; } } /* save the current peer information before updating it */ old_daddr = sk->sk_v6_daddr; old_fl6_flowlabel = np->flow_label; old_dport = inet->inet_dport; sk->sk_v6_daddr = *daddr; np->flow_label = fl6_flowlabel; inet->inet_dport = usin->sin6_port; /* * Check for a route to destination an obtain the * destination cache for it. */ err = ip6_datagram_dst_update(sk, true); if (err) { /* Restore the socket peer info, to keep it consistent with * the old socket state */ sk->sk_v6_daddr = old_daddr; np->flow_label = old_fl6_flowlabel; inet->inet_dport = old_dport; goto out; } sk->sk_state = TCP_ESTABLISHED; sk_set_txhash(sk); out: return err; }
int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); struct in6_addr *daddr; int addr_type; int err; __be32 fl6_flowlabel = 0; if (usin->sin6_family == AF_INET) { if (__ipv6_only_sock(sk)) return -EAFNOSUPPORT; err = __ip4_datagram_connect(sk, uaddr, addr_len); goto ipv4_connected; } if (addr_len < SIN6_LEN_RFC2133) return -EINVAL; if (usin->sin6_family != AF_INET6) return -EAFNOSUPPORT; if (np->sndflow) fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; addr_type = ipv6_addr_type(&usin->sin6_addr); if (addr_type == IPV6_ADDR_ANY) { /* * connect to self */ usin->sin6_addr.s6_addr[15] = 0x01; } daddr = &usin->sin6_addr; if (addr_type == IPV6_ADDR_MAPPED) { struct sockaddr_in sin; if (__ipv6_only_sock(sk)) { err = -ENETUNREACH; goto out; } sin.sin_family = AF_INET; sin.sin_addr.s_addr = daddr->s6_addr32[3]; sin.sin_port = usin->sin6_port; err = __ip4_datagram_connect(sk, (struct sockaddr *) &sin, sizeof(sin)); ipv4_connected: if (err) goto out; ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); if (ipv6_addr_any(&np->saddr) || ipv6_mapped_addr_any(&np->saddr)) ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr); if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } goto out; } if (__ipv6_addr_needs_scope_id(addr_type)) { if (addr_len >= sizeof(struct sockaddr_in6) && usin->sin6_scope_id) { if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != usin->sin6_scope_id) { err = -EINVAL; goto out; } sk->sk_bound_dev_if = usin->sin6_scope_id; } if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) sk->sk_bound_dev_if = np->mcast_oif; /* Connect to link-local address requires an interface */ if (!sk->sk_bound_dev_if) { err = -EINVAL; goto out; } } sk->sk_v6_daddr = *daddr; np->flow_label = fl6_flowlabel; inet->inet_dport = usin->sin6_port; /* * Check for a route to destination an obtain the * destination cache for it. */ err = ip6_datagram_dst_update(sk, true); if (err) goto out; sk->sk_state = TCP_ESTABLISHED; sk_set_txhash(sk); out: return err; }
static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) { struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; struct inet_sock *inet = inet_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk); struct in6_addr *daddr, *final_p, final; struct dst_entry *dst; struct flowi6 fl6; struct ip6_flowlabel *flowlabel = NULL; struct ipv6_txoptions *opt; int addr_type; int err; if (usin->sin6_family == AF_INET) { if (__ipv6_only_sock(sk)) return -EAFNOSUPPORT; err = __ip4_datagram_connect(sk, uaddr, addr_len); goto ipv4_connected; } if (addr_len < SIN6_LEN_RFC2133) return -EINVAL; if (usin->sin6_family != AF_INET6) return -EAFNOSUPPORT; memset(&fl6, 0, sizeof(fl6)); if (np->sndflow) { fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); if (!flowlabel) return -EINVAL; } } addr_type = ipv6_addr_type(&usin->sin6_addr); if (addr_type == IPV6_ADDR_ANY) { /* * connect to self */ usin->sin6_addr.s6_addr[15] = 0x01; } daddr = &usin->sin6_addr; if (addr_type == IPV6_ADDR_MAPPED) { struct sockaddr_in sin; if (__ipv6_only_sock(sk)) { err = -ENETUNREACH; goto out; } sin.sin_family = AF_INET; sin.sin_addr.s_addr = daddr->s6_addr32[3]; sin.sin_port = usin->sin6_port; err = __ip4_datagram_connect(sk, (struct sockaddr *) &sin, sizeof(sin)); ipv4_connected: if (err) goto out; ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); if (ipv6_addr_any(&np->saddr) || ipv6_mapped_addr_any(&np->saddr)) ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, &sk->sk_v6_rcv_saddr); if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } goto out; } if (__ipv6_addr_needs_scope_id(addr_type)) { if (addr_len >= sizeof(struct sockaddr_in6) && usin->sin6_scope_id) { if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != usin->sin6_scope_id) { err = -EINVAL; goto out; } sk->sk_bound_dev_if = usin->sin6_scope_id; } if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) sk->sk_bound_dev_if = np->mcast_oif; /* Connect to link-local address requires an interface */ if (!sk->sk_bound_dev_if) { err = -EINVAL; goto out; } } sk->sk_v6_daddr = *daddr; np->flow_label = fl6.flowlabel; inet->inet_dport = usin->sin6_port; /* * Check for a route to destination an obtain the * destination cache for it. */ fl6.flowi6_proto = sk->sk_protocol; fl6.daddr = sk->sk_v6_daddr; fl6.saddr = np->saddr; fl6.flowi6_oif = sk->sk_bound_dev_if; fl6.flowi6_mark = sk->sk_mark; fl6.fl6_dport = inet->inet_dport; fl6.fl6_sport = inet->inet_sport; if (!fl6.flowi6_oif) fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) fl6.flowi6_oif = np->mcast_oif; security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); rcu_read_lock(); opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); final_p = fl6_update_dst(&fl6, opt, &final); rcu_read_unlock(); dst = ip6_dst_lookup_flow(sk, &fl6, final_p); err = 0; if (IS_ERR(dst)) { err = PTR_ERR(dst); goto out; } /* source address lookup done in ip6_dst_lookup */ if (ipv6_addr_any(&np->saddr)) np->saddr = fl6.saddr; if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { sk->sk_v6_rcv_saddr = fl6.saddr; inet->inet_rcv_saddr = LOOPBACK4_IPV6; if (sk->sk_prot->rehash) sk->sk_prot->rehash(sk); } ip6_dst_store(sk, dst, ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? &sk->sk_v6_daddr : NULL, #ifdef CONFIG_IPV6_SUBTREES ipv6_addr_equal(&fl6.saddr, &np->saddr) ? &np->saddr : #endif NULL); sk->sk_state = TCP_ESTABLISHED; sk_set_txhash(sk); out: fl6_sock_release(flowlabel); return err; }