| /* |
| * TCP over IPv6 |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * Based on: |
| * linux/net/ipv4/tcp.c |
| * linux/net/ipv4/tcp_input.c |
| * linux/net/ipv4/tcp_output.c |
| * |
| * Fixes: |
| * Hideaki YOSHIFUJI : sin6_scope_id support |
| * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| * a single port at the same time. |
| * YOSHIFUJI Hideaki @USAGI: convert /proc/net/tcp6 to seq_file. |
| * |
| * 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. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/jiffies.h> |
| #include <linux/in.h> |
| #include <linux/in6.h> |
| #include <linux/netdevice.h> |
| #include <linux/init.h> |
| #include <linux/jhash.h> |
| #include <linux/ipsec.h> |
| #include <linux/times.h> |
| |
| #include <linux/ipv6.h> |
| #include <linux/icmpv6.h> |
| #include <linux/random.h> |
| |
| #include <net/tcp.h> |
| #include <net/ndisc.h> |
| #include <net/inet6_hashtables.h> |
| #include <net/inet6_connection_sock.h> |
| #include <net/ipv6.h> |
| #include <net/transp_v6.h> |
| #include <net/addrconf.h> |
| #include <net/ip6_route.h> |
| #include <net/ip6_checksum.h> |
| #include <net/inet_ecn.h> |
| #include <net/protocol.h> |
| #include <net/xfrm.h> |
| #include <net/snmp.h> |
| #include <net/dsfield.h> |
| #include <net/timewait_sock.h> |
| #include <net/netdma.h> |
| #include <net/inet_common.h> |
| |
| #include <asm/uaccess.h> |
| |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| |
| #include <linux/crypto.h> |
| #include <linux/scatterlist.h> |
| |
| static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb); |
| static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req); |
| static void tcp_v6_send_check(struct sock *sk, int len, |
| struct sk_buff *skb); |
| |
| static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb); |
| |
| static struct inet_connection_sock_af_ops ipv6_mapped; |
| static struct inet_connection_sock_af_ops ipv6_specific; |
| #ifdef CONFIG_TCP_MD5SIG |
| static struct tcp_sock_af_ops tcp_sock_ipv6_specific; |
| static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific; |
| #endif |
| |
| static void tcp_v6_hash(struct sock *sk) |
| { |
| if (sk->sk_state != TCP_CLOSE) { |
| if (inet_csk(sk)->icsk_af_ops == &ipv6_mapped) { |
| tcp_prot.hash(sk); |
| return; |
| } |
| local_bh_disable(); |
| __inet6_hash(sk); |
| local_bh_enable(); |
| } |
| } |
| |
| static __inline__ __sum16 tcp_v6_check(struct tcphdr *th, int len, |
| struct in6_addr *saddr, |
| struct in6_addr *daddr, |
| __wsum base) |
| { |
| return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); |
| } |
| |
| static __u32 tcp_v6_init_sequence(struct sk_buff *skb) |
| { |
| return secure_tcpv6_sequence_number(ipv6_hdr(skb)->daddr.s6_addr32, |
| ipv6_hdr(skb)->saddr.s6_addr32, |
| tcp_hdr(skb)->dest, |
| tcp_hdr(skb)->source); |
| } |
| |
| static int tcp_v6_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 inet_connection_sock *icsk = inet_csk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct tcp_sock *tp = tcp_sk(sk); |
| struct in6_addr *saddr = NULL, *final_p = NULL, final; |
| struct flowi fl; |
| struct dst_entry *dst; |
| int addr_type; |
| int err; |
| |
| if (addr_len < SIN6_LEN_RFC2133) |
| return -EINVAL; |
| |
| if (usin->sin6_family != AF_INET6) |
| return(-EAFNOSUPPORT); |
| |
| memset(&fl, 0, sizeof(fl)); |
| |
| if (np->sndflow) { |
| fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| IP6_ECN_flow_init(fl.fl6_flowlabel); |
| if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { |
| struct ip6_flowlabel *flowlabel; |
| flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| if (flowlabel == NULL) |
| return -EINVAL; |
| ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst); |
| fl6_sock_release(flowlabel); |
| } |
| } |
| |
| /* |
| * connect() to INADDR_ANY means loopback (BSD'ism). |
| */ |
| |
| if(ipv6_addr_any(&usin->sin6_addr)) |
| usin->sin6_addr.s6_addr[15] = 0x1; |
| |
| addr_type = ipv6_addr_type(&usin->sin6_addr); |
| |
| if(addr_type & IPV6_ADDR_MULTICAST) |
| return -ENETUNREACH; |
| |
| if (addr_type&IPV6_ADDR_LINKLOCAL) { |
| if (addr_len >= sizeof(struct sockaddr_in6) && |
| usin->sin6_scope_id) { |
| /* If interface is set while binding, indices |
| * must coincide. |
| */ |
| if (sk->sk_bound_dev_if && |
| sk->sk_bound_dev_if != usin->sin6_scope_id) |
| return -EINVAL; |
| |
| sk->sk_bound_dev_if = usin->sin6_scope_id; |
| } |
| |
| /* Connect to link-local address requires an interface */ |
| if (!sk->sk_bound_dev_if) |
| return -EINVAL; |
| } |
| |
| if (tp->rx_opt.ts_recent_stamp && |
| !ipv6_addr_equal(&np->daddr, &usin->sin6_addr)) { |
| tp->rx_opt.ts_recent = 0; |
| tp->rx_opt.ts_recent_stamp = 0; |
| tp->write_seq = 0; |
| } |
| |
| ipv6_addr_copy(&np->daddr, &usin->sin6_addr); |
| np->flow_label = fl.fl6_flowlabel; |
| |
| /* |
| * TCP over IPv4 |
| */ |
| |
| if (addr_type == IPV6_ADDR_MAPPED) { |
| u32 exthdrlen = icsk->icsk_ext_hdr_len; |
| struct sockaddr_in sin; |
| |
| SOCK_DEBUG(sk, "connect: ipv4 mapped\n"); |
| |
| if (__ipv6_only_sock(sk)) |
| return -ENETUNREACH; |
| |
| sin.sin_family = AF_INET; |
| sin.sin_port = usin->sin6_port; |
| sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
| |
| icsk->icsk_af_ops = &ipv6_mapped; |
| sk->sk_backlog_rcv = tcp_v4_do_rcv; |
| #ifdef CONFIG_TCP_MD5SIG |
| tp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| #endif |
| |
| err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin)); |
| |
| if (err) { |
| icsk->icsk_ext_hdr_len = exthdrlen; |
| icsk->icsk_af_ops = &ipv6_specific; |
| sk->sk_backlog_rcv = tcp_v6_do_rcv; |
| #ifdef CONFIG_TCP_MD5SIG |
| tp->af_specific = &tcp_sock_ipv6_specific; |
| #endif |
| goto failure; |
| } else { |
| ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF), |
| inet->saddr); |
| ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF), |
| inet->rcv_saddr); |
| } |
| |
| return err; |
| } |
| |
| if (!ipv6_addr_any(&np->rcv_saddr)) |
| saddr = &np->rcv_saddr; |
| |
| fl.proto = IPPROTO_TCP; |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| ipv6_addr_copy(&fl.fl6_src, |
| (saddr ? saddr : &np->saddr)); |
| fl.oif = sk->sk_bound_dev_if; |
| fl.fl_ip_dport = usin->sin6_port; |
| fl.fl_ip_sport = inet->sport; |
| |
| if (np->opt && np->opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| |
| security_sk_classify_flow(sk, &fl); |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) |
| goto failure; |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
| if (err == -EREMOTE) |
| err = ip6_dst_blackhole(sk, &dst, &fl); |
| if (err < 0) |
| goto failure; |
| } |
| |
| if (saddr == NULL) { |
| saddr = &fl.fl6_src; |
| ipv6_addr_copy(&np->rcv_saddr, saddr); |
| } |
| |
| /* set the source address */ |
| ipv6_addr_copy(&np->saddr, saddr); |
| inet->rcv_saddr = LOOPBACK4_IPV6; |
| |
| sk->sk_gso_type = SKB_GSO_TCPV6; |
| __ip6_dst_store(sk, dst, NULL, NULL); |
| |
| icsk->icsk_ext_hdr_len = 0; |
| if (np->opt) |
| icsk->icsk_ext_hdr_len = (np->opt->opt_flen + |
| np->opt->opt_nflen); |
| |
| tp->rx_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| |
| inet->dport = usin->sin6_port; |
| |
| tcp_set_state(sk, TCP_SYN_SENT); |
| err = inet6_hash_connect(&tcp_death_row, sk); |
| if (err) |
| goto late_failure; |
| |
| if (!tp->write_seq) |
| tp->write_seq = secure_tcpv6_sequence_number(np->saddr.s6_addr32, |
| np->daddr.s6_addr32, |
| inet->sport, |
| inet->dport); |
| |
| err = tcp_connect(sk); |
| if (err) |
| goto late_failure; |
| |
| return 0; |
| |
| late_failure: |
| tcp_set_state(sk, TCP_CLOSE); |
| __sk_dst_reset(sk); |
| failure: |
| inet->dport = 0; |
| sk->sk_route_caps = 0; |
| return err; |
| } |
| |
| static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| int type, int code, int offset, __be32 info) |
| { |
| struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; |
| const struct tcphdr *th = (struct tcphdr *)(skb->data+offset); |
| struct ipv6_pinfo *np; |
| struct sock *sk; |
| int err; |
| struct tcp_sock *tp; |
| __u32 seq; |
| |
| sk = inet6_lookup(dev_net(skb->dev), &tcp_hashinfo, &hdr->daddr, |
| th->dest, &hdr->saddr, th->source, skb->dev->ifindex); |
| |
| if (sk == NULL) { |
| ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
| return; |
| } |
| |
| if (sk->sk_state == TCP_TIME_WAIT) { |
| inet_twsk_put(inet_twsk(sk)); |
| return; |
| } |
| |
| bh_lock_sock(sk); |
| if (sock_owned_by_user(sk)) |
| NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS); |
| |
| if (sk->sk_state == TCP_CLOSE) |
| goto out; |
| |
| tp = tcp_sk(sk); |
| seq = ntohl(th->seq); |
| if (sk->sk_state != TCP_LISTEN && |
| !between(seq, tp->snd_una, tp->snd_nxt)) { |
| NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| goto out; |
| } |
| |
| np = inet6_sk(sk); |
| |
| if (type == ICMPV6_PKT_TOOBIG) { |
| struct dst_entry *dst = NULL; |
| |
| if (sock_owned_by_user(sk)) |
| goto out; |
| if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) |
| goto out; |
| |
| /* icmp should have updated the destination cache entry */ |
| dst = __sk_dst_check(sk, np->dst_cookie); |
| |
| if (dst == NULL) { |
| struct inet_sock *inet = inet_sk(sk); |
| struct flowi fl; |
| |
| /* BUGGG_FUTURE: Again, it is not clear how |
| to handle rthdr case. Ignore this complexity |
| for now. |
| */ |
| memset(&fl, 0, sizeof(fl)); |
| fl.proto = IPPROTO_TCP; |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| fl.oif = sk->sk_bound_dev_if; |
| fl.fl_ip_dport = inet->dport; |
| fl.fl_ip_sport = inet->sport; |
| security_skb_classify_flow(skb, &fl); |
| |
| if ((err = ip6_dst_lookup(sk, &dst, &fl))) { |
| sk->sk_err_soft = -err; |
| goto out; |
| } |
| |
| if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { |
| sk->sk_err_soft = -err; |
| goto out; |
| } |
| |
| } else |
| dst_hold(dst); |
| |
| if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { |
| tcp_sync_mss(sk, dst_mtu(dst)); |
| tcp_simple_retransmit(sk); |
| } /* else let the usual retransmit timer handle it */ |
| dst_release(dst); |
| goto out; |
| } |
| |
| icmpv6_err_convert(type, code, &err); |
| |
| /* Might be for an request_sock */ |
| switch (sk->sk_state) { |
| struct request_sock *req, **prev; |
| case TCP_LISTEN: |
| if (sock_owned_by_user(sk)) |
| goto out; |
| |
| req = inet6_csk_search_req(sk, &prev, th->dest, &hdr->daddr, |
| &hdr->saddr, inet6_iif(skb)); |
| if (!req) |
| goto out; |
| |
| /* ICMPs are not backlogged, hence we cannot get |
| * an established socket here. |
| */ |
| BUG_TRAP(req->sk == NULL); |
| |
| if (seq != tcp_rsk(req)->snt_isn) { |
| NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS); |
| goto out; |
| } |
| |
| inet_csk_reqsk_queue_drop(sk, req, prev); |
| goto out; |
| |
| case TCP_SYN_SENT: |
| case TCP_SYN_RECV: /* Cannot happen. |
| It can, it SYNs are crossed. --ANK */ |
| if (!sock_owned_by_user(sk)) { |
| sk->sk_err = err; |
| sk->sk_error_report(sk); /* Wake people up to see the error (see connect in sock.c) */ |
| |
| tcp_done(sk); |
| } else |
| sk->sk_err_soft = err; |
| goto out; |
| } |
| |
| if (!sock_owned_by_user(sk) && np->recverr) { |
| sk->sk_err = err; |
| sk->sk_error_report(sk); |
| } else |
| sk->sk_err_soft = err; |
| |
| out: |
| bh_unlock_sock(sk); |
| sock_put(sk); |
| } |
| |
| |
| static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req) |
| { |
| struct inet6_request_sock *treq = inet6_rsk(req); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sk_buff * skb; |
| struct ipv6_txoptions *opt = NULL; |
| struct in6_addr * final_p = NULL, final; |
| struct flowi fl; |
| struct dst_entry *dst; |
| int err = -1; |
| |
| memset(&fl, 0, sizeof(fl)); |
| fl.proto = IPPROTO_TCP; |
| ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
| ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
| fl.fl6_flowlabel = 0; |
| fl.oif = treq->iif; |
| fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
| fl.fl_ip_sport = inet_sk(sk)->sport; |
| security_req_classify_flow(req, &fl); |
| |
| opt = np->opt; |
| if (opt && opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| |
| err = ip6_dst_lookup(sk, &dst, &fl); |
| if (err) |
| goto done; |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| goto done; |
| |
| skb = tcp_make_synack(sk, dst, req); |
| if (skb) { |
| struct tcphdr *th = tcp_hdr(skb); |
| |
| th->check = tcp_v6_check(th, skb->len, |
| &treq->loc_addr, &treq->rmt_addr, |
| csum_partial((char *)th, skb->len, skb->csum)); |
| |
| ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
| err = ip6_xmit(sk, skb, &fl, opt, 0); |
| err = net_xmit_eval(err); |
| } |
| |
| done: |
| if (opt && opt != np->opt) |
| sock_kfree_s(sk, opt, opt->tot_len); |
| dst_release(dst); |
| return err; |
| } |
| |
| static inline void syn_flood_warning(struct sk_buff *skb) |
| { |
| #ifdef CONFIG_SYN_COOKIES |
| if (sysctl_tcp_syncookies) |
| printk(KERN_INFO |
| "TCPv6: Possible SYN flooding on port %d. " |
| "Sending cookies.\n", ntohs(tcp_hdr(skb)->dest)); |
| else |
| #endif |
| printk(KERN_INFO |
| "TCPv6: Possible SYN flooding on port %d. " |
| "Dropping request.\n", ntohs(tcp_hdr(skb)->dest)); |
| } |
| |
| static void tcp_v6_reqsk_destructor(struct request_sock *req) |
| { |
| if (inet6_rsk(req)->pktopts) |
| kfree_skb(inet6_rsk(req)->pktopts); |
| } |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(struct sock *sk, |
| struct in6_addr *addr) |
| { |
| struct tcp_sock *tp = tcp_sk(sk); |
| int i; |
| |
| BUG_ON(tp == NULL); |
| |
| if (!tp->md5sig_info || !tp->md5sig_info->entries6) |
| return NULL; |
| |
| for (i = 0; i < tp->md5sig_info->entries6; i++) { |
| if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, addr)) |
| return &tp->md5sig_info->keys6[i].base; |
| } |
| return NULL; |
| } |
| |
| static struct tcp_md5sig_key *tcp_v6_md5_lookup(struct sock *sk, |
| struct sock *addr_sk) |
| { |
| return tcp_v6_md5_do_lookup(sk, &inet6_sk(addr_sk)->daddr); |
| } |
| |
| static struct tcp_md5sig_key *tcp_v6_reqsk_md5_lookup(struct sock *sk, |
| struct request_sock *req) |
| { |
| return tcp_v6_md5_do_lookup(sk, &inet6_rsk(req)->rmt_addr); |
| } |
| |
| static int tcp_v6_md5_do_add(struct sock *sk, struct in6_addr *peer, |
| char *newkey, u8 newkeylen) |
| { |
| /* Add key to the list */ |
| struct tcp_md5sig_key *key; |
| struct tcp_sock *tp = tcp_sk(sk); |
| struct tcp6_md5sig_key *keys; |
| |
| key = tcp_v6_md5_do_lookup(sk, peer); |
| if (key) { |
| /* modify existing entry - just update that one */ |
| kfree(key->key); |
| key->key = newkey; |
| key->keylen = newkeylen; |
| } else { |
| /* reallocate new list if current one is full. */ |
| if (!tp->md5sig_info) { |
| tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info), GFP_ATOMIC); |
| if (!tp->md5sig_info) { |
| kfree(newkey); |
| return -ENOMEM; |
| } |
| sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
| } |
| if (tcp_alloc_md5sig_pool() == NULL) { |
| kfree(newkey); |
| return -ENOMEM; |
| } |
| if (tp->md5sig_info->alloced6 == tp->md5sig_info->entries6) { |
| keys = kmalloc((sizeof (tp->md5sig_info->keys6[0]) * |
| (tp->md5sig_info->entries6 + 1)), GFP_ATOMIC); |
| |
| if (!keys) { |
| tcp_free_md5sig_pool(); |
| kfree(newkey); |
| return -ENOMEM; |
| } |
| |
| if (tp->md5sig_info->entries6) |
| memmove(keys, tp->md5sig_info->keys6, |
| (sizeof (tp->md5sig_info->keys6[0]) * |
| tp->md5sig_info->entries6)); |
| |
| kfree(tp->md5sig_info->keys6); |
| tp->md5sig_info->keys6 = keys; |
| tp->md5sig_info->alloced6++; |
| } |
| |
| ipv6_addr_copy(&tp->md5sig_info->keys6[tp->md5sig_info->entries6].addr, |
| peer); |
| tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.key = newkey; |
| tp->md5sig_info->keys6[tp->md5sig_info->entries6].base.keylen = newkeylen; |
| |
| tp->md5sig_info->entries6++; |
| } |
| return 0; |
| } |
| |
| static int tcp_v6_md5_add_func(struct sock *sk, struct sock *addr_sk, |
| u8 *newkey, __u8 newkeylen) |
| { |
| return tcp_v6_md5_do_add(sk, &inet6_sk(addr_sk)->daddr, |
| newkey, newkeylen); |
| } |
| |
| static int tcp_v6_md5_do_del(struct sock *sk, struct in6_addr *peer) |
| { |
| struct tcp_sock *tp = tcp_sk(sk); |
| int i; |
| |
| for (i = 0; i < tp->md5sig_info->entries6; i++) { |
| if (ipv6_addr_equal(&tp->md5sig_info->keys6[i].addr, peer)) { |
| /* Free the key */ |
| kfree(tp->md5sig_info->keys6[i].base.key); |
| tp->md5sig_info->entries6--; |
| |
| if (tp->md5sig_info->entries6 == 0) { |
| kfree(tp->md5sig_info->keys6); |
| tp->md5sig_info->keys6 = NULL; |
| tp->md5sig_info->alloced6 = 0; |
| } else { |
| /* shrink the database */ |
| if (tp->md5sig_info->entries6 != i) |
| memmove(&tp->md5sig_info->keys6[i], |
| &tp->md5sig_info->keys6[i+1], |
| (tp->md5sig_info->entries6 - i) |
| * sizeof (tp->md5sig_info->keys6[0])); |
| } |
| tcp_free_md5sig_pool(); |
| return 0; |
| } |
| } |
| return -ENOENT; |
| } |
| |
| static void tcp_v6_clear_md5_list (struct sock *sk) |
| { |
| struct tcp_sock *tp = tcp_sk(sk); |
| int i; |
| |
| if (tp->md5sig_info->entries6) { |
| for (i = 0; i < tp->md5sig_info->entries6; i++) |
| kfree(tp->md5sig_info->keys6[i].base.key); |
| tp->md5sig_info->entries6 = 0; |
| tcp_free_md5sig_pool(); |
| } |
| |
| kfree(tp->md5sig_info->keys6); |
| tp->md5sig_info->keys6 = NULL; |
| tp->md5sig_info->alloced6 = 0; |
| |
| if (tp->md5sig_info->entries4) { |
| for (i = 0; i < tp->md5sig_info->entries4; i++) |
| kfree(tp->md5sig_info->keys4[i].base.key); |
| tp->md5sig_info->entries4 = 0; |
| tcp_free_md5sig_pool(); |
| } |
| |
| kfree(tp->md5sig_info->keys4); |
| tp->md5sig_info->keys4 = NULL; |
| tp->md5sig_info->alloced4 = 0; |
| } |
| |
| static int tcp_v6_parse_md5_keys (struct sock *sk, char __user *optval, |
| int optlen) |
| { |
| struct tcp_md5sig cmd; |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr; |
| u8 *newkey; |
| |
| if (optlen < sizeof(cmd)) |
| return -EINVAL; |
| |
| if (copy_from_user(&cmd, optval, sizeof(cmd))) |
| return -EFAULT; |
| |
| if (sin6->sin6_family != AF_INET6) |
| return -EINVAL; |
| |
| if (!cmd.tcpm_keylen) { |
| if (!tcp_sk(sk)->md5sig_info) |
| return -ENOENT; |
| if (ipv6_addr_v4mapped(&sin6->sin6_addr)) |
| return tcp_v4_md5_do_del(sk, sin6->sin6_addr.s6_addr32[3]); |
| return tcp_v6_md5_do_del(sk, &sin6->sin6_addr); |
| } |
| |
| if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN) |
| return -EINVAL; |
| |
| if (!tcp_sk(sk)->md5sig_info) { |
| struct tcp_sock *tp = tcp_sk(sk); |
| struct tcp_md5sig_info *p; |
| |
| p = kzalloc(sizeof(struct tcp_md5sig_info), GFP_KERNEL); |
| if (!p) |
| return -ENOMEM; |
| |
| tp->md5sig_info = p; |
| sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
| } |
| |
| newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL); |
| if (!newkey) |
| return -ENOMEM; |
| if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { |
| return tcp_v4_md5_do_add(sk, sin6->sin6_addr.s6_addr32[3], |
| newkey, cmd.tcpm_keylen); |
| } |
| return tcp_v6_md5_do_add(sk, &sin6->sin6_addr, newkey, cmd.tcpm_keylen); |
| } |
| |
| static int tcp_v6_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
| struct in6_addr *saddr, |
| struct in6_addr *daddr, |
| struct tcphdr *th, int protocol, |
| unsigned int tcplen) |
| { |
| struct scatterlist sg[4]; |
| __u16 data_len; |
| int block = 0; |
| __sum16 cksum; |
| struct tcp_md5sig_pool *hp; |
| struct tcp6_pseudohdr *bp; |
| struct hash_desc *desc; |
| int err; |
| unsigned int nbytes = 0; |
| |
| hp = tcp_get_md5sig_pool(); |
| if (!hp) { |
| printk(KERN_WARNING "%s(): hash pool not found...\n", __func__); |
| goto clear_hash_noput; |
| } |
| bp = &hp->md5_blk.ip6; |
| desc = &hp->md5_desc; |
| |
| /* 1. TCP pseudo-header (RFC2460) */ |
| ipv6_addr_copy(&bp->saddr, saddr); |
| ipv6_addr_copy(&bp->daddr, daddr); |
| bp->len = htonl(tcplen); |
| bp->protocol = htonl(protocol); |
| |
| sg_init_table(sg, 4); |
| |
| sg_set_buf(&sg[block++], bp, sizeof(*bp)); |
| nbytes += sizeof(*bp); |
| |
| /* 2. TCP header, excluding options */ |
| cksum = th->check; |
| th->check = 0; |
| sg_set_buf(&sg[block++], th, sizeof(*th)); |
| nbytes += sizeof(*th); |
| |
| /* 3. TCP segment data (if any) */ |
| data_len = tcplen - (th->doff << 2); |
| if (data_len > 0) { |
| u8 *data = (u8 *)th + (th->doff << 2); |
| sg_set_buf(&sg[block++], data, data_len); |
| nbytes += data_len; |
| } |
| |
| /* 4. shared key */ |
| sg_set_buf(&sg[block++], key->key, key->keylen); |
| nbytes += key->keylen; |
| |
| sg_mark_end(&sg[block - 1]); |
| |
| /* Now store the hash into the packet */ |
| err = crypto_hash_init(desc); |
| if (err) { |
| printk(KERN_WARNING "%s(): hash_init failed\n", __func__); |
| goto clear_hash; |
| } |
| err = crypto_hash_update(desc, sg, nbytes); |
| if (err) { |
| printk(KERN_WARNING "%s(): hash_update failed\n", __func__); |
| goto clear_hash; |
| } |
| err = crypto_hash_final(desc, md5_hash); |
| if (err) { |
| printk(KERN_WARNING "%s(): hash_final failed\n", __func__); |
| goto clear_hash; |
| } |
| |
| /* Reset header, and free up the crypto */ |
| tcp_put_md5sig_pool(); |
| th->check = cksum; |
| out: |
| return 0; |
| clear_hash: |
| tcp_put_md5sig_pool(); |
| clear_hash_noput: |
| memset(md5_hash, 0, 16); |
| goto out; |
| } |
| |
| static int tcp_v6_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key, |
| struct sock *sk, |
| struct dst_entry *dst, |
| struct request_sock *req, |
| struct tcphdr *th, int protocol, |
| unsigned int tcplen) |
| { |
| struct in6_addr *saddr, *daddr; |
| |
| if (sk) { |
| saddr = &inet6_sk(sk)->saddr; |
| daddr = &inet6_sk(sk)->daddr; |
| } else { |
| saddr = &inet6_rsk(req)->loc_addr; |
| daddr = &inet6_rsk(req)->rmt_addr; |
| } |
| return tcp_v6_do_calc_md5_hash(md5_hash, key, |
| saddr, daddr, |
| th, protocol, tcplen); |
| } |
| |
| static int tcp_v6_inbound_md5_hash (struct sock *sk, struct sk_buff *skb) |
| { |
| __u8 *hash_location = NULL; |
| struct tcp_md5sig_key *hash_expected; |
| struct ipv6hdr *ip6h = ipv6_hdr(skb); |
| struct tcphdr *th = tcp_hdr(skb); |
| int length = (th->doff << 2) - sizeof (*th); |
| int genhash; |
| u8 *ptr; |
| u8 newhash[16]; |
| |
| hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr); |
| |
| /* If the TCP option is too short, we can short cut */ |
| if (length < TCPOLEN_MD5SIG) |
| return hash_expected ? 1 : 0; |
| |
| /* parse options */ |
| ptr = (u8*)(th + 1); |
| while (length > 0) { |
| int opcode = *ptr++; |
| int opsize; |
| |
| switch(opcode) { |
| case TCPOPT_EOL: |
| goto done_opts; |
| case TCPOPT_NOP: |
| length--; |
| continue; |
| default: |
| opsize = *ptr++; |
| if (opsize < 2 || opsize > length) |
| goto done_opts; |
| if (opcode == TCPOPT_MD5SIG) { |
| hash_location = ptr; |
| goto done_opts; |
| } |
| } |
| ptr += opsize - 2; |
| length -= opsize; |
| } |
| |
| done_opts: |
| /* do we have a hash as expected? */ |
| if (!hash_expected) { |
| if (!hash_location) |
| return 0; |
| if (net_ratelimit()) { |
| printk(KERN_INFO "MD5 Hash NOT expected but found " |
| "(" NIP6_FMT ", %u)->" |
| "(" NIP6_FMT ", %u)\n", |
| NIP6(ip6h->saddr), ntohs(th->source), |
| NIP6(ip6h->daddr), ntohs(th->dest)); |
| } |
| return 1; |
| } |
| |
| if (!hash_location) { |
| if (net_ratelimit()) { |
| printk(KERN_INFO "MD5 Hash expected but NOT found " |
| "(" NIP6_FMT ", %u)->" |
| "(" NIP6_FMT ", %u)\n", |
| NIP6(ip6h->saddr), ntohs(th->source), |
| NIP6(ip6h->daddr), ntohs(th->dest)); |
| } |
| return 1; |
| } |
| |
| /* check the signature */ |
| genhash = tcp_v6_do_calc_md5_hash(newhash, |
| hash_expected, |
| &ip6h->saddr, &ip6h->daddr, |
| th, sk->sk_protocol, |
| skb->len); |
| if (genhash || memcmp(hash_location, newhash, 16) != 0) { |
| if (net_ratelimit()) { |
| printk(KERN_INFO "MD5 Hash %s for " |
| "(" NIP6_FMT ", %u)->" |
| "(" NIP6_FMT ", %u)\n", |
| genhash ? "failed" : "mismatch", |
| NIP6(ip6h->saddr), ntohs(th->source), |
| NIP6(ip6h->daddr), ntohs(th->dest)); |
| } |
| return 1; |
| } |
| return 0; |
| } |
| #endif |
| |
| struct request_sock_ops tcp6_request_sock_ops __read_mostly = { |
| .family = AF_INET6, |
| .obj_size = sizeof(struct tcp6_request_sock), |
| .rtx_syn_ack = tcp_v6_send_synack, |
| .send_ack = tcp_v6_reqsk_send_ack, |
| .destructor = tcp_v6_reqsk_destructor, |
| .send_reset = tcp_v6_send_reset |
| }; |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| static struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = { |
| .md5_lookup = tcp_v6_reqsk_md5_lookup, |
| }; |
| #endif |
| |
| static struct timewait_sock_ops tcp6_timewait_sock_ops = { |
| .twsk_obj_size = sizeof(struct tcp6_timewait_sock), |
| .twsk_unique = tcp_twsk_unique, |
| .twsk_destructor= tcp_twsk_destructor, |
| }; |
| |
| static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct tcphdr *th = tcp_hdr(skb); |
| |
| if (skb->ip_summed == CHECKSUM_PARTIAL) { |
| th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0); |
| skb->csum_start = skb_transport_header(skb) - skb->head; |
| skb->csum_offset = offsetof(struct tcphdr, check); |
| } else { |
| th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, |
| csum_partial((char *)th, th->doff<<2, |
| skb->csum)); |
| } |
| } |
| |
| static int tcp_v6_gso_send_check(struct sk_buff *skb) |
| { |
| struct ipv6hdr *ipv6h; |
| struct tcphdr *th; |
| |
| if (!pskb_may_pull(skb, sizeof(*th))) |
| return -EINVAL; |
| |
| ipv6h = ipv6_hdr(skb); |
| th = tcp_hdr(skb); |
| |
| th->check = 0; |
| th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, |
| IPPROTO_TCP, 0); |
| skb->csum_start = skb_transport_header(skb) - skb->head; |
| skb->csum_offset = offsetof(struct tcphdr, check); |
| skb->ip_summed = CHECKSUM_PARTIAL; |
| return 0; |
| } |
| |
| static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb) |
| { |
| struct tcphdr *th = tcp_hdr(skb), *t1; |
| struct sk_buff *buff; |
| struct flowi fl; |
| struct net *net = dev_net(skb->dst->dev); |
| struct sock *ctl_sk = net->ipv6.tcp_sk; |
| unsigned int tot_len = sizeof(*th); |
| #ifdef CONFIG_TCP_MD5SIG |
| struct tcp_md5sig_key *key; |
| #endif |
| |
| if (th->rst) |
| return; |
| |
| if (!ipv6_unicast_destination(skb)) |
| return; |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| if (sk) |
| key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->daddr); |
| else |
| key = NULL; |
| |
| if (key) |
| tot_len += TCPOLEN_MD5SIG_ALIGNED; |
| #endif |
| |
| /* |
| * We need to grab some memory, and put together an RST, |
| * and then put it into the queue to be sent. |
| */ |
| |
| buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
| GFP_ATOMIC); |
| if (buff == NULL) |
| return; |
| |
| skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
| |
| t1 = (struct tcphdr *) skb_push(buff, tot_len); |
| |
| /* Swap the send and the receive. */ |
| memset(t1, 0, sizeof(*t1)); |
| t1->dest = th->source; |
| t1->source = th->dest; |
| t1->doff = tot_len / 4; |
| t1->rst = 1; |
| |
| if(th->ack) { |
| t1->seq = th->ack_seq; |
| } else { |
| t1->ack = 1; |
| t1->ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin |
| + skb->len - (th->doff<<2)); |
| } |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| if (key) { |
| __be32 *opt = (__be32*)(t1 + 1); |
| opt[0] = htonl((TCPOPT_NOP << 24) | |
| (TCPOPT_NOP << 16) | |
| (TCPOPT_MD5SIG << 8) | |
| TCPOLEN_MD5SIG); |
| tcp_v6_do_calc_md5_hash((__u8 *)&opt[1], key, |
| &ipv6_hdr(skb)->daddr, |
| &ipv6_hdr(skb)->saddr, |
| t1, IPPROTO_TCP, tot_len); |
| } |
| #endif |
| |
| buff->csum = csum_partial((char *)t1, sizeof(*t1), 0); |
| |
| memset(&fl, 0, sizeof(fl)); |
| ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
| ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); |
| |
| t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, |
| sizeof(*t1), IPPROTO_TCP, |
| buff->csum); |
| |
| fl.proto = IPPROTO_TCP; |
| fl.oif = inet6_iif(skb); |
| fl.fl_ip_dport = t1->dest; |
| fl.fl_ip_sport = t1->source; |
| security_skb_classify_flow(skb, &fl); |
| |
| /* Pass a socket to ip6_dst_lookup either it is for RST |
| * Underlying function will use this to retrieve the network |
| * namespace |
| */ |
| if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
| |
| if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
| ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
| TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
| TCP_INC_STATS_BH(TCP_MIB_OUTRSTS); |
| return; |
| } |
| } |
| |
| kfree_skb(buff); |
| } |
| |
| static void tcp_v6_send_ack(struct tcp_timewait_sock *tw, |
| struct sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts) |
| { |
| struct tcphdr *th = tcp_hdr(skb), *t1; |
| struct sk_buff *buff; |
| struct flowi fl; |
| struct net *net = dev_net(skb->dev); |
| struct sock *ctl_sk = net->ipv6.tcp_sk; |
| unsigned int tot_len = sizeof(struct tcphdr); |
| __be32 *topt; |
| #ifdef CONFIG_TCP_MD5SIG |
| struct tcp_md5sig_key *key; |
| struct tcp_md5sig_key tw_key; |
| #endif |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| if (!tw && skb->sk) { |
| key = tcp_v6_md5_do_lookup(skb->sk, &ipv6_hdr(skb)->daddr); |
| } else if (tw && tw->tw_md5_keylen) { |
| tw_key.key = tw->tw_md5_key; |
| tw_key.keylen = tw->tw_md5_keylen; |
| key = &tw_key; |
| } else { |
| key = NULL; |
| } |
| #endif |
| |
| if (ts) |
| tot_len += TCPOLEN_TSTAMP_ALIGNED; |
| #ifdef CONFIG_TCP_MD5SIG |
| if (key) |
| tot_len += TCPOLEN_MD5SIG_ALIGNED; |
| #endif |
| |
| buff = alloc_skb(MAX_HEADER + sizeof(struct ipv6hdr) + tot_len, |
| GFP_ATOMIC); |
| if (buff == NULL) |
| return; |
| |
| skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + tot_len); |
| |
| t1 = (struct tcphdr *) skb_push(buff,tot_len); |
| |
| /* Swap the send and the receive. */ |
| memset(t1, 0, sizeof(*t1)); |
| t1->dest = th->source; |
| t1->source = th->dest; |
| t1->doff = tot_len/4; |
| t1->seq = htonl(seq); |
| t1->ack_seq = htonl(ack); |
| t1->ack = 1; |
| t1->window = htons(win); |
| |
| topt = (__be32 *)(t1 + 1); |
| |
| if (ts) { |
| *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP); |
| *topt++ = htonl(tcp_time_stamp); |
| *topt = htonl(ts); |
| } |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| if (key) { |
| *topt++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) | |
| (TCPOPT_MD5SIG << 8) | TCPOLEN_MD5SIG); |
| tcp_v6_do_calc_md5_hash((__u8 *)topt, key, |
| &ipv6_hdr(skb)->daddr, |
| &ipv6_hdr(skb)->saddr, |
| t1, IPPROTO_TCP, tot_len); |
| } |
| #endif |
| |
| buff->csum = csum_partial((char *)t1, tot_len, 0); |
| |
| memset(&fl, 0, sizeof(fl)); |
| ipv6_addr_copy(&fl.fl6_dst, &ipv6_hdr(skb)->saddr); |
| ipv6_addr_copy(&fl.fl6_src, &ipv6_hdr(skb)->daddr); |
| |
| t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst, |
| tot_len, IPPROTO_TCP, |
| buff->csum); |
| |
| fl.proto = IPPROTO_TCP; |
| fl.oif = inet6_iif(skb); |
| fl.fl_ip_dport = t1->dest; |
| fl.fl_ip_sport = t1->source; |
| security_skb_classify_flow(skb, &fl); |
| |
| if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) { |
| if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) { |
| ip6_xmit(ctl_sk, buff, &fl, NULL, 0); |
| TCP_INC_STATS_BH(TCP_MIB_OUTSEGS); |
| return; |
| } |
| } |
| |
| kfree_skb(buff); |
| } |
| |
| static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb) |
| { |
| struct inet_timewait_sock *tw = inet_twsk(sk); |
| struct tcp_timewait_sock *tcptw = tcp_twsk(sk); |
| |
| tcp_v6_send_ack(tcptw, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt, |
| tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, |
| tcptw->tw_ts_recent); |
| |
| inet_twsk_put(tw); |
| } |
| |
| static void tcp_v6_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req) |
| { |
| tcp_v6_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd, req->ts_recent); |
| } |
| |
| |
| static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb) |
| { |
| struct request_sock *req, **prev; |
| const struct tcphdr *th = tcp_hdr(skb); |
| struct sock *nsk; |
| |
| /* Find possible connection requests. */ |
| req = inet6_csk_search_req(sk, &prev, th->source, |
| &ipv6_hdr(skb)->saddr, |
| &ipv6_hdr(skb)->daddr, inet6_iif(skb)); |
| if (req) |
| return tcp_check_req(sk, skb, req, prev); |
| |
| nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo, |
| &ipv6_hdr(skb)->saddr, th->source, |
| &ipv6_hdr(skb)->daddr, ntohs(th->dest), inet6_iif(skb)); |
| |
| if (nsk) { |
| if (nsk->sk_state != TCP_TIME_WAIT) { |
| bh_lock_sock(nsk); |
| return nsk; |
| } |
| inet_twsk_put(inet_twsk(nsk)); |
| return NULL; |
| } |
| |
| #ifdef CONFIG_SYN_COOKIES |
| if (!th->rst && !th->syn && th->ack) |
| sk = cookie_v6_check(sk, skb); |
| #endif |
| return sk; |
| } |
| |
| /* FIXME: this is substantially similar to the ipv4 code. |
| * Can some kind of merge be done? -- erics |
| */ |
| static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
| { |
| struct inet6_request_sock *treq; |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct tcp_options_received tmp_opt; |
| struct tcp_sock *tp = tcp_sk(sk); |
| struct request_sock *req = NULL; |
| __u32 isn = TCP_SKB_CB(skb)->when; |
| #ifdef CONFIG_SYN_COOKIES |
| int want_cookie = 0; |
| #else |
| #define want_cookie 0 |
| #endif |
| |
| if (skb->protocol == htons(ETH_P_IP)) |
| return tcp_v4_conn_request(sk, skb); |
| |
| if (!ipv6_unicast_destination(skb)) |
| goto drop; |
| |
| if (inet_csk_reqsk_queue_is_full(sk) && !isn) { |
| if (net_ratelimit()) |
| syn_flood_warning(skb); |
| #ifdef CONFIG_SYN_COOKIES |
| if (sysctl_tcp_syncookies) |
| want_cookie = 1; |
| else |
| #endif |
| goto drop; |
| } |
| |
| if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) |
| goto drop; |
| |
| req = inet6_reqsk_alloc(&tcp6_request_sock_ops); |
| if (req == NULL) |
| goto drop; |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| tcp_rsk(req)->af_specific = &tcp_request_sock_ipv6_ops; |
| #endif |
| |
| tcp_clear_options(&tmp_opt); |
| tmp_opt.mss_clamp = IPV6_MIN_MTU - sizeof(struct tcphdr) - sizeof(struct ipv6hdr); |
| tmp_opt.user_mss = tp->rx_opt.user_mss; |
| |
| tcp_parse_options(skb, &tmp_opt, 0); |
| |
| if (want_cookie && !tmp_opt.saw_tstamp) |
| tcp_clear_options(&tmp_opt); |
| |
| tmp_opt.tstamp_ok = tmp_opt.saw_tstamp; |
| tcp_openreq_init(req, &tmp_opt, skb); |
| |
| treq = inet6_rsk(req); |
| ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr); |
| ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr); |
| treq->pktopts = NULL; |
| if (!want_cookie) |
| TCP_ECN_create_request(req, tcp_hdr(skb)); |
| |
| if (want_cookie) { |
| isn = cookie_v6_init_sequence(sk, skb, &req->mss); |
| req->cookie_ts = tmp_opt.tstamp_ok; |
| } else if (!isn) { |
| if (ipv6_opt_accepted(sk, skb) || |
| np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
| np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
| atomic_inc(&skb->users); |
| treq->pktopts = skb; |
| } |
| treq->iif = sk->sk_bound_dev_if; |
| |
| /* So that link locals have meaning */ |
| if (!sk->sk_bound_dev_if && |
| ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL) |
| treq->iif = inet6_iif(skb); |
| |
| isn = tcp_v6_init_sequence(skb); |
| } |
| |
| tcp_rsk(req)->snt_isn = isn; |
| |
| security_inet_conn_request(sk, skb, req); |
| |
| if (tcp_v6_send_synack(sk, req)) |
| goto drop; |
| |
| if (!want_cookie) { |
| inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT); |
| return 0; |
| } |
| |
| drop: |
| if (req) |
| reqsk_free(req); |
| |
| return 0; /* don't send reset */ |
| } |
| |
| static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb, |
| struct request_sock *req, |
| struct dst_entry *dst) |
| { |
| struct inet6_request_sock *treq = inet6_rsk(req); |
| struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| struct tcp6_sock *newtcp6sk; |
| struct inet_sock *newinet; |
| struct tcp_sock *newtp; |
| struct sock *newsk; |
| struct ipv6_txoptions *opt; |
| #ifdef CONFIG_TCP_MD5SIG |
| struct tcp_md5sig_key *key; |
| #endif |
| |
| if (skb->protocol == htons(ETH_P_IP)) { |
| /* |
| * v6 mapped |
| */ |
| |
| newsk = tcp_v4_syn_recv_sock(sk, skb, req, dst); |
| |
| if (newsk == NULL) |
| return NULL; |
| |
| newtcp6sk = (struct tcp6_sock *)newsk; |
| inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| |
| newinet = inet_sk(newsk); |
| newnp = inet6_sk(newsk); |
| newtp = tcp_sk(newsk); |
| |
| memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| |
| ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF), |
| newinet->daddr); |
| |
| ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF), |
| newinet->saddr); |
| |
| ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr); |
| |
| inet_csk(newsk)->icsk_af_ops = &ipv6_mapped; |
| newsk->sk_backlog_rcv = tcp_v4_do_rcv; |
| #ifdef CONFIG_TCP_MD5SIG |
| newtp->af_specific = &tcp_sock_ipv6_mapped_specific; |
| #endif |
| |
| newnp->pktoptions = NULL; |
| newnp->opt = NULL; |
| newnp->mcast_oif = inet6_iif(skb); |
| newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
| |
| /* |
| * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
| * here, tcp_create_openreq_child now does this for us, see the comment in |
| * that function for the gory details. -acme |
| */ |
| |
| /* It is tricky place. Until this moment IPv4 tcp |
| worked with IPv6 icsk.icsk_af_ops. |
| Sync it now. |
| */ |
| tcp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie); |
| |
| return newsk; |
| } |
| |
| opt = np->opt; |
| |
| if (sk_acceptq_is_full(sk)) |
| goto out_overflow; |
| |
| if (dst == NULL) { |
| struct in6_addr *final_p = NULL, final; |
| struct flowi fl; |
| |
| memset(&fl, 0, sizeof(fl)); |
| fl.proto = IPPROTO_TCP; |
| ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr); |
| if (opt && opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr); |
| fl.oif = sk->sk_bound_dev_if; |
| fl.fl_ip_dport = inet_rsk(req)->rmt_port; |
| fl.fl_ip_sport = inet_sk(sk)->sport; |
| security_req_classify_flow(req, &fl); |
| |
| if (ip6_dst_lookup(sk, &dst, &fl)) |
| goto out; |
| |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0) |
| goto out; |
| } |
| |
| newsk = tcp_create_openreq_child(sk, req, skb); |
| if (newsk == NULL) |
| goto out; |
| |
| /* |
| * No need to charge this sock to the relevant IPv6 refcnt debug socks |
| * count here, tcp_create_openreq_child now does this for us, see the |
| * comment in that function for the gory details. -acme |
| */ |
| |
| newsk->sk_gso_type = SKB_GSO_TCPV6; |
| __ip6_dst_store(newsk, dst, NULL, NULL); |
| |
| newtcp6sk = (struct tcp6_sock *)newsk; |
| inet_sk(newsk)->pinet6 = &newtcp6sk->inet6; |
| |
| newtp = tcp_sk(newsk); |
| newinet = inet_sk(newsk); |
| newnp = inet6_sk(newsk); |
| |
| memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| |
| ipv6_addr_copy(&newnp->daddr, &treq->rmt_addr); |
| ipv6_addr_copy(&newnp->saddr, &treq->loc_addr); |
| ipv6_addr_copy(&newnp->rcv_saddr, &treq->loc_addr); |
| newsk->sk_bound_dev_if = treq->iif; |
| |
| /* Now IPv6 options... |
| |
| First: no IPv4 options. |
| */ |
| newinet->opt = NULL; |
| newnp->ipv6_fl_list = NULL; |
| |
| /* Clone RX bits */ |
| newnp->rxopt.all = np->rxopt.all; |
| |
| /* Clone pktoptions received with SYN */ |
| newnp->pktoptions = NULL; |
| if (treq->pktopts != NULL) { |
| newnp->pktoptions = skb_clone(treq->pktopts, GFP_ATOMIC); |
| kfree_skb(treq->pktopts); |
| treq->pktopts = NULL; |
| if (newnp->pktoptions) |
| skb_set_owner_r(newnp->pktoptions, newsk); |
| } |
| newnp->opt = NULL; |
| newnp->mcast_oif = inet6_iif(skb); |
| newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
| |
| /* Clone native IPv6 options from listening socket (if any) |
| |
| Yes, keeping reference count would be much more clever, |
| but we make one more one thing there: reattach optmem |
| to newsk. |
| */ |
| if (opt) { |
| newnp->opt = ipv6_dup_options(newsk, opt); |
| if (opt != np->opt) |
| sock_kfree_s(sk, opt, opt->tot_len); |
| } |
| |
| inet_csk(newsk)->icsk_ext_hdr_len = 0; |
| if (newnp->opt) |
| inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen + |
| newnp->opt->opt_flen); |
| |
| tcp_mtup_init(newsk); |
| tcp_sync_mss(newsk, dst_mtu(dst)); |
| newtp->advmss = dst_metric(dst, RTAX_ADVMSS); |
| tcp_initialize_rcv_mss(newsk); |
| |
| newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6; |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| /* Copy over the MD5 key from the original socket */ |
| if ((key = tcp_v6_md5_do_lookup(sk, &newnp->daddr)) != NULL) { |
| /* We're using one, so create a matching key |
| * on the newsk structure. If we fail to get |
| * memory, then we end up not copying the key |
| * across. Shucks. |
| */ |
| char *newkey = kmemdup(key->key, key->keylen, GFP_ATOMIC); |
| if (newkey != NULL) |
| tcp_v6_md5_do_add(newsk, &inet6_sk(sk)->daddr, |
| newkey, key->keylen); |
| } |
| #endif |
| |
| __inet6_hash(newsk); |
| __inet_inherit_port(sk, newsk); |
| |
| return newsk; |
| |
| out_overflow: |
| NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS); |
| out: |
| NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS); |
| if (opt && opt != np->opt) |
| sock_kfree_s(sk, opt, opt->tot_len); |
| dst_release(dst); |
| return NULL; |
| } |
| |
| static __sum16 tcp_v6_checksum_init(struct sk_buff *skb) |
| { |
| if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| if (!tcp_v6_check(tcp_hdr(skb), skb->len, &ipv6_hdr(skb)->saddr, |
| &ipv6_hdr(skb)->daddr, skb->csum)) { |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| return 0; |
| } |
| } |
| |
| skb->csum = ~csum_unfold(tcp_v6_check(tcp_hdr(skb), skb->len, |
| &ipv6_hdr(skb)->saddr, |
| &ipv6_hdr(skb)->daddr, 0)); |
| |
| if (skb->len <= 76) { |
| return __skb_checksum_complete(skb); |
| } |
| return 0; |
| } |
| |
| /* The socket must have it's spinlock held when we get |
| * here. |
| * |
| * We have a potential double-lock case here, so even when |
| * doing backlog processing we use the BH locking scheme. |
| * This is because we cannot sleep with the original spinlock |
| * held. |
| */ |
| static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct tcp_sock *tp; |
| struct sk_buff *opt_skb = NULL; |
| |
| /* Imagine: socket is IPv6. IPv4 packet arrives, |
| goes to IPv4 receive handler and backlogged. |
| From backlog it always goes here. Kerboom... |
| Fortunately, tcp_rcv_established and rcv_established |
| handle them correctly, but it is not case with |
| tcp_v6_hnd_req and tcp_v6_send_reset(). --ANK |
| */ |
| |
| if (skb->protocol == htons(ETH_P_IP)) |
| return tcp_v4_do_rcv(sk, skb); |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| if (tcp_v6_inbound_md5_hash (sk, skb)) |
| goto discard; |
| #endif |
| |
| if (sk_filter(sk, skb)) |
| goto discard; |
| |
| /* |
| * socket locking is here for SMP purposes as backlog rcv |
| * is currently called with bh processing disabled. |
| */ |
| |
| /* Do Stevens' IPV6_PKTOPTIONS. |
| |
| Yes, guys, it is the only place in our code, where we |
| may make it not affecting IPv4. |
| The rest of code is protocol independent, |
| and I do not like idea to uglify IPv4. |
| |
| Actually, all the idea behind IPV6_PKTOPTIONS |
| looks not very well thought. For now we latch |
| options, received in the last packet, enqueued |
| by tcp. Feel free to propose better solution. |
| --ANK (980728) |
| */ |
| if (np->rxopt.all) |
| opt_skb = skb_clone(skb, GFP_ATOMIC); |
| |
| if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */ |
| TCP_CHECK_TIMER(sk); |
| if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) |
| goto reset; |
| TCP_CHECK_TIMER(sk); |
| if (opt_skb) |
| goto ipv6_pktoptions; |
| return 0; |
| } |
| |
| if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb)) |
| goto csum_err; |
| |
| if (sk->sk_state == TCP_LISTEN) { |
| struct sock *nsk = tcp_v6_hnd_req(sk, skb); |
| if (!nsk) |
| goto discard; |
| |
| /* |
| * Queue it on the new socket if the new socket is active, |
| * otherwise we just shortcircuit this and continue with |
| * the new socket.. |
| */ |
| if(nsk != sk) { |
| if (tcp_child_process(sk, nsk, skb)) |
| goto reset; |
| if (opt_skb) |
| __kfree_skb(opt_skb); |
| return 0; |
| } |
| } |
| |
| TCP_CHECK_TIMER(sk); |
| if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) |
| goto reset; |
| TCP_CHECK_TIMER(sk); |
| if (opt_skb) |
| goto ipv6_pktoptions; |
| return 0; |
| |
| reset: |
| tcp_v6_send_reset(sk, skb); |
| discard: |
| if (opt_skb) |
| __kfree_skb(opt_skb); |
| kfree_skb(skb); |
| return 0; |
| csum_err: |
| TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| goto discard; |
| |
| |
| ipv6_pktoptions: |
| /* Do you ask, what is it? |
| |
| 1. skb was enqueued by tcp. |
| 2. skb is added to tail of read queue, rather than out of order. |
| 3. socket is not in passive state. |
| 4. Finally, it really contains options, which user wants to receive. |
| */ |
| tp = tcp_sk(sk); |
| if (TCP_SKB_CB(opt_skb)->end_seq == tp->rcv_nxt && |
| !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) { |
| if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
| np->mcast_oif = inet6_iif(opt_skb); |
| if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
| np->mcast_hops = ipv6_hdr(opt_skb)->hop_limit; |
| if (ipv6_opt_accepted(sk, opt_skb)) { |
| skb_set_owner_r(opt_skb, sk); |
| opt_skb = xchg(&np->pktoptions, opt_skb); |
| } else { |
| __kfree_skb(opt_skb); |
| opt_skb = xchg(&np->pktoptions, NULL); |
| } |
| } |
| |
| if (opt_skb) |
| kfree_skb(opt_skb); |
| return 0; |
| } |
| |
| static int tcp_v6_rcv(struct sk_buff *skb) |
| { |
| struct tcphdr *th; |
| struct sock *sk; |
| int ret; |
| |
| if (skb->pkt_type != PACKET_HOST) |
| goto discard_it; |
| |
| /* |
| * Count it even if it's bad. |
| */ |
| TCP_INC_STATS_BH(TCP_MIB_INSEGS); |
| |
| if (!pskb_may_pull(skb, sizeof(struct tcphdr))) |
| goto discard_it; |
| |
| th = tcp_hdr(skb); |
| |
| if (th->doff < sizeof(struct tcphdr)/4) |
| goto bad_packet; |
| if (!pskb_may_pull(skb, th->doff*4)) |
| goto discard_it; |
| |
| if (!skb_csum_unnecessary(skb) && tcp_v6_checksum_init(skb)) |
| goto bad_packet; |
| |
| th = tcp_hdr(skb); |
| TCP_SKB_CB(skb)->seq = ntohl(th->seq); |
| TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin + |
| skb->len - th->doff*4); |
| TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq); |
| TCP_SKB_CB(skb)->when = 0; |
| TCP_SKB_CB(skb)->flags = ipv6_get_dsfield(ipv6_hdr(skb)); |
| TCP_SKB_CB(skb)->sacked = 0; |
| |
| sk = __inet6_lookup(dev_net(skb->dev), &tcp_hashinfo, |
| &ipv6_hdr(skb)->saddr, th->source, |
| &ipv6_hdr(skb)->daddr, ntohs(th->dest), |
| inet6_iif(skb)); |
| |
| if (!sk) |
| goto no_tcp_socket; |
| |
| process: |
| if (sk->sk_state == TCP_TIME_WAIT) |
| goto do_time_wait; |
| |
| if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| goto discard_and_relse; |
| |
| if (sk_filter(sk, skb)) |
| goto discard_and_relse; |
| |
| skb->dev = NULL; |
| |
| bh_lock_sock_nested(sk); |
| ret = 0; |
| if (!sock_owned_by_user(sk)) { |
| #ifdef CONFIG_NET_DMA |
| struct tcp_sock *tp = tcp_sk(sk); |
| if (!tp->ucopy.dma_chan && tp->ucopy.pinned_list) |
| tp->ucopy.dma_chan = get_softnet_dma(); |
| if (tp->ucopy.dma_chan) |
| ret = tcp_v6_do_rcv(sk, skb); |
| else |
| #endif |
| { |
| if (!tcp_prequeue(sk, skb)) |
| ret = tcp_v6_do_rcv(sk, skb); |
| } |
| } else |
| sk_add_backlog(sk, skb); |
| bh_unlock_sock(sk); |
| |
| sock_put(sk); |
| return ret ? -1 : 0; |
| |
| no_tcp_socket: |
| if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| goto discard_it; |
| |
| if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| bad_packet: |
| TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| } else { |
| tcp_v6_send_reset(NULL, skb); |
| } |
| |
| discard_it: |
| |
| /* |
| * Discard frame |
| */ |
| |
| kfree_skb(skb); |
| return 0; |
| |
| discard_and_relse: |
| sock_put(sk); |
| goto discard_it; |
| |
| do_time_wait: |
| if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) { |
| inet_twsk_put(inet_twsk(sk)); |
| goto discard_it; |
| } |
| |
| if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) { |
| TCP_INC_STATS_BH(TCP_MIB_INERRS); |
| inet_twsk_put(inet_twsk(sk)); |
| goto discard_it; |
| } |
| |
| switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) { |
| case TCP_TW_SYN: |
| { |
| struct sock *sk2; |
| |
| sk2 = inet6_lookup_listener(dev_net(skb->dev), &tcp_hashinfo, |
| &ipv6_hdr(skb)->daddr, |
| ntohs(th->dest), inet6_iif(skb)); |
| if (sk2 != NULL) { |
| struct inet_timewait_sock *tw = inet_twsk(sk); |
| inet_twsk_deschedule(tw, &tcp_death_row); |
| inet_twsk_put(tw); |
| sk = sk2; |
| goto process; |
| } |
| /* Fall through to ACK */ |
| } |
| case TCP_TW_ACK: |
| tcp_v6_timewait_ack(sk, skb); |
| break; |
| case TCP_TW_RST: |
| goto no_tcp_socket; |
| case TCP_TW_SUCCESS:; |
| } |
| goto discard_it; |
| } |
| |
| static int tcp_v6_remember_stamp(struct sock *sk) |
| { |
| /* Alas, not yet... */ |
| return 0; |
| } |
| |
| static struct inet_connection_sock_af_ops ipv6_specific = { |
| .queue_xmit = inet6_csk_xmit, |
| .send_check = tcp_v6_send_check, |
| .rebuild_header = inet6_sk_rebuild_header, |
| .conn_request = tcp_v6_conn_request, |
| .syn_recv_sock = tcp_v6_syn_recv_sock, |
| .remember_stamp = tcp_v6_remember_stamp, |
| .net_header_len = sizeof(struct ipv6hdr), |
| .setsockopt = ipv6_setsockopt, |
| .getsockopt = ipv6_getsockopt, |
| .addr2sockaddr = inet6_csk_addr2sockaddr, |
| .sockaddr_len = sizeof(struct sockaddr_in6), |
| .bind_conflict = inet6_csk_bind_conflict, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_ipv6_setsockopt, |
| .compat_getsockopt = compat_ipv6_getsockopt, |
| #endif |
| }; |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| static struct tcp_sock_af_ops tcp_sock_ipv6_specific = { |
| .md5_lookup = tcp_v6_md5_lookup, |
| .calc_md5_hash = tcp_v6_calc_md5_hash, |
| .md5_add = tcp_v6_md5_add_func, |
| .md5_parse = tcp_v6_parse_md5_keys, |
| }; |
| #endif |
| |
| /* |
| * TCP over IPv4 via INET6 API |
| */ |
| |
| static struct inet_connection_sock_af_ops ipv6_mapped = { |
| .queue_xmit = ip_queue_xmit, |
| .send_check = tcp_v4_send_check, |
| .rebuild_header = inet_sk_rebuild_header, |
| .conn_request = tcp_v6_conn_request, |
| .syn_recv_sock = tcp_v6_syn_recv_sock, |
| .remember_stamp = tcp_v4_remember_stamp, |
| .net_header_len = sizeof(struct iphdr), |
| .setsockopt = ipv6_setsockopt, |
| .getsockopt = ipv6_getsockopt, |
| .addr2sockaddr = inet6_csk_addr2sockaddr, |
| .sockaddr_len = sizeof(struct sockaddr_in6), |
| .bind_conflict = inet6_csk_bind_conflict, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_ipv6_setsockopt, |
| .compat_getsockopt = compat_ipv6_getsockopt, |
| #endif |
| }; |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| static struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific = { |
| .md5_lookup = tcp_v4_md5_lookup, |
| .calc_md5_hash = tcp_v4_calc_md5_hash, |
| .md5_add = tcp_v6_md5_add_func, |
| .md5_parse = tcp_v6_parse_md5_keys, |
| }; |
| #endif |
| |
| /* NOTE: A lot of things set to zero explicitly by call to |
| * sk_alloc() so need not be done here. |
| */ |
| static int tcp_v6_init_sock(struct sock *sk) |
| { |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| struct tcp_sock *tp = tcp_sk(sk); |
| |
| skb_queue_head_init(&tp->out_of_order_queue); |
| tcp_init_xmit_timers(sk); |
| tcp_prequeue_init(tp); |
| |
| icsk->icsk_rto = TCP_TIMEOUT_INIT; |
| tp->mdev = TCP_TIMEOUT_INIT; |
| |
| /* So many TCP implementations out there (incorrectly) count the |
| * initial SYN frame in their delayed-ACK and congestion control |
| * algorithms that we must have the following bandaid to talk |
| * efficiently to them. -DaveM |
| */ |
| tp->snd_cwnd = 2; |
| |
| /* See draft-stevens-tcpca-spec-01 for discussion of the |
| * initialization of these values. |
| */ |
| tp->snd_ssthresh = 0x7fffffff; |
| tp->snd_cwnd_clamp = ~0; |
| tp->mss_cache = 536; |
| |
| tp->reordering = sysctl_tcp_reordering; |
| |
| sk->sk_state = TCP_CLOSE; |
| |
| icsk->icsk_af_ops = &ipv6_specific; |
| icsk->icsk_ca_ops = &tcp_init_congestion_ops; |
| icsk->icsk_sync_mss = tcp_sync_mss; |
| sk->sk_write_space = sk_stream_write_space; |
| sock_set_flag(sk, SOCK_USE_WRITE_QUEUE); |
| |
| #ifdef CONFIG_TCP_MD5SIG |
| tp->af_specific = &tcp_sock_ipv6_specific; |
| #endif |
| |
| sk->sk_sndbuf = sysctl_tcp_wmem[1]; |
| sk->sk_rcvbuf = sysctl_tcp_rmem[1]; |
| |
| atomic_inc(&tcp_sockets_allocated); |
| |
| return 0; |
| } |
| |
| static int tcp_v6_destroy_sock(struct sock *sk) |
| { |
| #ifdef CONFIG_TCP_MD5SIG |
| /* Clean up the MD5 key list */ |
| if (tcp_sk(sk)->md5sig_info) |
| tcp_v6_clear_md5_list(sk); |
| #endif |
| tcp_v4_destroy_sock(sk); |
| return inet6_destroy_sock(sk); |
| } |
| |
| #ifdef CONFIG_PROC_FS |
| /* Proc filesystem TCPv6 sock list dumping. */ |
| static void get_openreq6(struct seq_file *seq, |
| struct sock *sk, struct request_sock *req, int i, int uid) |
| { |
| int ttd = req->expires - jiffies; |
| struct in6_addr *src = &inet6_rsk(req)->loc_addr; |
| struct in6_addr *dest = &inet6_rsk(req)->rmt_addr; |
| |
| if (ttd < 0) |
| ttd = 0; |
| |
| seq_printf(seq, |
| "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| i, |
| src->s6_addr32[0], src->s6_addr32[1], |
| src->s6_addr32[2], src->s6_addr32[3], |
| ntohs(inet_sk(sk)->sport), |
| dest->s6_addr32[0], dest->s6_addr32[1], |
| dest->s6_addr32[2], dest->s6_addr32[3], |
| ntohs(inet_rsk(req)->rmt_port), |
| TCP_SYN_RECV, |
| 0,0, /* could print option size, but that is af dependent. */ |
| 1, /* timers active (only the expire timer) */ |
| jiffies_to_clock_t(ttd), |
| req->retrans, |
| uid, |
| 0, /* non standard timer */ |
| 0, /* open_requests have no inode */ |
| 0, req); |
| } |
| |
| static void get_tcp6_sock(struct seq_file *seq, struct sock *sp, int i) |
| { |
| struct in6_addr *dest, *src; |
| __u16 destp, srcp; |
| int timer_active; |
| unsigned long timer_expires; |
| struct inet_sock *inet = inet_sk(sp); |
| struct tcp_sock *tp = tcp_sk(sp); |
| const struct inet_connection_sock *icsk = inet_csk(sp); |
| struct ipv6_pinfo *np = inet6_sk(sp); |
| |
| dest = &np->daddr; |
| src = &np->rcv_saddr; |
| destp = ntohs(inet->dport); |
| srcp = ntohs(inet->sport); |
| |
| if (icsk->icsk_pending == ICSK_TIME_RETRANS) { |
| timer_active = 1; |
| timer_expires = icsk->icsk_timeout; |
| } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) { |
| timer_active = 4; |
| timer_expires = icsk->icsk_timeout; |
| } else if (timer_pending(&sp->sk_timer)) { |
| timer_active = 2; |
| timer_expires = sp->sk_timer.expires; |
| } else { |
| timer_active = 0; |
| timer_expires = jiffies; |
| } |
| |
| seq_printf(seq, |
| "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %u %u %u %u %d\n", |
| i, |
| src->s6_addr32[0], src->s6_addr32[1], |
| src->s6_addr32[2], src->s6_addr32[3], srcp, |
| dest->s6_addr32[0], dest->s6_addr32[1], |
| dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| sp->sk_state, |
| tp->write_seq-tp->snd_una, |
| (sp->sk_state == TCP_LISTEN) ? sp->sk_ack_backlog : (tp->rcv_nxt - tp->copied_seq), |
| timer_active, |
| jiffies_to_clock_t(timer_expires - jiffies), |
| icsk->icsk_retransmits, |
| sock_i_uid(sp), |
| icsk->icsk_probes_out, |
| sock_i_ino(sp), |
| atomic_read(&sp->sk_refcnt), sp, |
| icsk->icsk_rto, |
| icsk->icsk_ack.ato, |
| (icsk->icsk_ack.quick << 1 ) | icsk->icsk_ack.pingpong, |
| tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh |
| ); |
| } |
| |
| static void get_timewait6_sock(struct seq_file *seq, |
| struct inet_timewait_sock *tw, int i) |
| { |
| struct in6_addr *dest, *src; |
| __u16 destp, srcp; |
| struct inet6_timewait_sock *tw6 = inet6_twsk((struct sock *)tw); |
| int ttd = tw->tw_ttd - jiffies; |
| |
| if (ttd < 0) |
| ttd = 0; |
| |
| dest = &tw6->tw_v6_daddr; |
| src = &tw6->tw_v6_rcv_saddr; |
| destp = ntohs(tw->tw_dport); |
| srcp = ntohs(tw->tw_sport); |
| |
| seq_printf(seq, |
| "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| "%02X %08X:%08X %02X:%08lX %08X %5d %8d %d %d %p\n", |
| i, |
| src->s6_addr32[0], src->s6_addr32[1], |
| src->s6_addr32[2], src->s6_addr32[3], srcp, |
| dest->s6_addr32[0], dest->s6_addr32[1], |
| dest->s6_addr32[2], dest->s6_addr32[3], destp, |
| tw->tw_substate, 0, 0, |
| 3, jiffies_to_clock_t(ttd), 0, 0, 0, 0, |
| atomic_read(&tw->tw_refcnt), tw); |
| } |
| |
| static int tcp6_seq_show(struct seq_file *seq, void *v) |
| { |
| struct tcp_iter_state *st; |
| |
| if (v == SEQ_START_TOKEN) { |
| seq_puts(seq, |
| " sl " |
| "local_address " |
| "remote_address " |
| "st tx_queue rx_queue tr tm->when retrnsmt" |
| " uid timeout inode\n"); |
| goto out; |
| } |
| st = seq->private; |
| |
| switch (st->state) { |
| case TCP_SEQ_STATE_LISTENING: |
| case TCP_SEQ_STATE_ESTABLISHED: |
| get_tcp6_sock(seq, v, st->num); |
| break; |
| case TCP_SEQ_STATE_OPENREQ: |
| get_openreq6(seq, st->syn_wait_sk, v, st->num, st->uid); |
| break; |
| case TCP_SEQ_STATE_TIME_WAIT: |
| get_timewait6_sock(seq, v, st->num); |
| break; |
| } |
| out: |
| return 0; |
| } |
| |
| static struct tcp_seq_afinfo tcp6_seq_afinfo = { |
| .name = "tcp6", |
| .family = AF_INET6, |
| .seq_fops = { |
| .owner = THIS_MODULE, |
| }, |
| .seq_ops = { |
| .show = tcp6_seq_show, |
| }, |
| }; |
| |
| int tcp6_proc_init(struct net *net) |
| { |
| return tcp_proc_register(net, &tcp6_seq_afinfo); |
| } |
| |
| void tcp6_proc_exit(struct net *net) |
| { |
| tcp_proc_unregister(net, &tcp6_seq_afinfo); |
| } |
| #endif |
| |
| struct proto tcpv6_prot = { |
| .name = "TCPv6", |
| .owner = THIS_MODULE, |
| .close = tcp_close, |
| .connect = tcp_v6_connect, |
| .disconnect = tcp_disconnect, |
| .accept = inet_csk_accept, |
| .ioctl = tcp_ioctl, |
| .init = tcp_v6_init_sock, |
| .destroy = tcp_v6_destroy_sock, |
| .shutdown = tcp_shutdown, |
| .setsockopt = tcp_setsockopt, |
| .getsockopt = tcp_getsockopt, |
| .recvmsg = tcp_recvmsg, |
| .backlog_rcv = tcp_v6_do_rcv, |
| .hash = tcp_v6_hash, |
| .unhash = inet_unhash, |
| .get_port = inet_csk_get_port, |
| .enter_memory_pressure = tcp_enter_memory_pressure, |
| .sockets_allocated = &tcp_sockets_allocated, |
| .memory_allocated = &tcp_memory_allocated, |
| .memory_pressure = &tcp_memory_pressure, |
| .orphan_count = &tcp_orphan_count, |
| .sysctl_mem = sysctl_tcp_mem, |
| .sysctl_wmem = sysctl_tcp_wmem, |
| .sysctl_rmem = sysctl_tcp_rmem, |
| .max_header = MAX_TCP_HEADER, |
| .obj_size = sizeof(struct tcp6_sock), |
| .twsk_prot = &tcp6_timewait_sock_ops, |
| .rsk_prot = &tcp6_request_sock_ops, |
| .h.hashinfo = &tcp_hashinfo, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_tcp_setsockopt, |
| .compat_getsockopt = compat_tcp_getsockopt, |
| #endif |
| }; |
| |
| static struct inet6_protocol tcpv6_protocol = { |
| .handler = tcp_v6_rcv, |
| .err_handler = tcp_v6_err, |
| .gso_send_check = tcp_v6_gso_send_check, |
| .gso_segment = tcp_tso_segment, |
| .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| }; |
| |
| static struct inet_protosw tcpv6_protosw = { |
| .type = SOCK_STREAM, |
| .protocol = IPPROTO_TCP, |
| .prot = &tcpv6_prot, |
| .ops = &inet6_stream_ops, |
| .capability = -1, |
| .no_check = 0, |
| .flags = INET_PROTOSW_PERMANENT | |
| INET_PROTOSW_ICSK, |
| }; |
| |
| static int tcpv6_net_init(struct net *net) |
| { |
| return inet_ctl_sock_create(&net->ipv6.tcp_sk, PF_INET6, |
| SOCK_RAW, IPPROTO_TCP, net); |
| } |
| |
| static void tcpv6_net_exit(struct net *net) |
| { |
| inet_ctl_sock_destroy(net->ipv6.tcp_sk); |
| } |
| |
| static struct pernet_operations tcpv6_net_ops = { |
| .init = tcpv6_net_init, |
| .exit = tcpv6_net_exit, |
| }; |
| |
| int __init tcpv6_init(void) |
| { |
| int ret; |
| |
| ret = inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| if (ret) |
| goto out; |
| |
| /* register inet6 protocol */ |
| ret = inet6_register_protosw(&tcpv6_protosw); |
| if (ret) |
| goto out_tcpv6_protocol; |
| |
| ret = register_pernet_subsys(&tcpv6_net_ops); |
| if (ret) |
| goto out_tcpv6_protosw; |
| out: |
| return ret; |
| |
| out_tcpv6_protocol: |
| inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| out_tcpv6_protosw: |
| inet6_unregister_protosw(&tcpv6_protosw); |
| goto out; |
| } |
| |
| void tcpv6_exit(void) |
| { |
| unregister_pernet_subsys(&tcpv6_net_ops); |
| inet6_unregister_protosw(&tcpv6_protosw); |
| inet6_del_protocol(&tcpv6_protocol, IPPROTO_TCP); |
| } |