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Diffstat (limited to 'net/ipv6/tcp_ipv6.c')
-rw-r--r--net/ipv6/tcp_ipv6.c2265
1 files changed, 2265 insertions, 0 deletions
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
new file mode 100644
index 00000000000..4760c85e19d
--- /dev/null
+++ b/net/ipv6/tcp_ipv6.c
@@ -0,0 +1,2265 @@
+/*
+ * TCP over IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * $Id: tcp_ipv6.c,v 1.144 2002/02/01 22:01:04 davem Exp $
+ *
+ * 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/config.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/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/addrconf.h>
+#include <net/snmp.h>
+#include <net/dsfield.h>
+
+#include <asm/uaccess.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+static void tcp_v6_send_reset(struct sk_buff *skb);
+static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req);
+static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len,
+ struct sk_buff *skb);
+
+static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
+static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok);
+
+static struct tcp_func ipv6_mapped;
+static struct tcp_func ipv6_specific;
+
+/* I have no idea if this is a good hash for v6 or not. -DaveM */
+static __inline__ int tcp_v6_hashfn(struct in6_addr *laddr, u16 lport,
+ struct in6_addr *faddr, u16 fport)
+{
+ int hashent = (lport ^ fport);
+
+ hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
+ hashent ^= hashent>>16;
+ hashent ^= hashent>>8;
+ return (hashent & (tcp_ehash_size - 1));
+}
+
+static __inline__ int tcp_v6_sk_hashfn(struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *laddr = &np->rcv_saddr;
+ struct in6_addr *faddr = &np->daddr;
+ __u16 lport = inet->num;
+ __u16 fport = inet->dport;
+ return tcp_v6_hashfn(laddr, lport, faddr, fport);
+}
+
+static inline int tcp_v6_bind_conflict(struct sock *sk,
+ struct tcp_bind_bucket *tb)
+{
+ struct sock *sk2;
+ struct hlist_node *node;
+
+ /* We must walk the whole port owner list in this case. -DaveM */
+ sk_for_each_bound(sk2, node, &tb->owners) {
+ if (sk != sk2 &&
+ (!sk->sk_bound_dev_if ||
+ !sk2->sk_bound_dev_if ||
+ sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
+ (!sk->sk_reuse || !sk2->sk_reuse ||
+ sk2->sk_state == TCP_LISTEN) &&
+ ipv6_rcv_saddr_equal(sk, sk2))
+ break;
+ }
+
+ return node != NULL;
+}
+
+/* Grrr, addr_type already calculated by caller, but I don't want
+ * to add some silly "cookie" argument to this method just for that.
+ * But it doesn't matter, the recalculation is in the rarest path
+ * this function ever takes.
+ */
+static int tcp_v6_get_port(struct sock *sk, unsigned short snum)
+{
+ struct tcp_bind_hashbucket *head;
+ struct tcp_bind_bucket *tb;
+ struct hlist_node *node;
+ int ret;
+
+ local_bh_disable();
+ if (snum == 0) {
+ int low = sysctl_local_port_range[0];
+ int high = sysctl_local_port_range[1];
+ int remaining = (high - low) + 1;
+ int rover;
+
+ spin_lock(&tcp_portalloc_lock);
+ rover = tcp_port_rover;
+ do { rover++;
+ if ((rover < low) || (rover > high))
+ rover = low;
+ head = &tcp_bhash[tcp_bhashfn(rover)];
+ spin_lock(&head->lock);
+ tb_for_each(tb, node, &head->chain)
+ if (tb->port == rover)
+ goto next;
+ break;
+ next:
+ spin_unlock(&head->lock);
+ } while (--remaining > 0);
+ tcp_port_rover = rover;
+ spin_unlock(&tcp_portalloc_lock);
+
+ /* Exhausted local port range during search? */
+ ret = 1;
+ if (remaining <= 0)
+ goto fail;
+
+ /* OK, here is the one we will use. */
+ snum = rover;
+ } else {
+ head = &tcp_bhash[tcp_bhashfn(snum)];
+ spin_lock(&head->lock);
+ tb_for_each(tb, node, &head->chain)
+ if (tb->port == snum)
+ goto tb_found;
+ }
+ tb = NULL;
+ goto tb_not_found;
+tb_found:
+ if (tb && !hlist_empty(&tb->owners)) {
+ if (tb->fastreuse > 0 && sk->sk_reuse &&
+ sk->sk_state != TCP_LISTEN) {
+ goto success;
+ } else {
+ ret = 1;
+ if (tcp_v6_bind_conflict(sk, tb))
+ goto fail_unlock;
+ }
+ }
+tb_not_found:
+ ret = 1;
+ if (!tb && (tb = tcp_bucket_create(head, snum)) == NULL)
+ goto fail_unlock;
+ if (hlist_empty(&tb->owners)) {
+ if (sk->sk_reuse && sk->sk_state != TCP_LISTEN)
+ tb->fastreuse = 1;
+ else
+ tb->fastreuse = 0;
+ } else if (tb->fastreuse &&
+ (!sk->sk_reuse || sk->sk_state == TCP_LISTEN))
+ tb->fastreuse = 0;
+
+success:
+ if (!tcp_sk(sk)->bind_hash)
+ tcp_bind_hash(sk, tb, snum);
+ BUG_TRAP(tcp_sk(sk)->bind_hash == tb);
+ ret = 0;
+
+fail_unlock:
+ spin_unlock(&head->lock);
+fail:
+ local_bh_enable();
+ return ret;
+}
+
+static __inline__ void __tcp_v6_hash(struct sock *sk)
+{
+ struct hlist_head *list;
+ rwlock_t *lock;
+
+ BUG_TRAP(sk_unhashed(sk));
+
+ if (sk->sk_state == TCP_LISTEN) {
+ list = &tcp_listening_hash[tcp_sk_listen_hashfn(sk)];
+ lock = &tcp_lhash_lock;
+ tcp_listen_wlock();
+ } else {
+ sk->sk_hashent = tcp_v6_sk_hashfn(sk);
+ list = &tcp_ehash[sk->sk_hashent].chain;
+ lock = &tcp_ehash[sk->sk_hashent].lock;
+ write_lock(lock);
+ }
+
+ __sk_add_node(sk, list);
+ sock_prot_inc_use(sk->sk_prot);
+ write_unlock(lock);
+}
+
+
+static void tcp_v6_hash(struct sock *sk)
+{
+ if (sk->sk_state != TCP_CLOSE) {
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ if (tp->af_specific == &ipv6_mapped) {
+ tcp_prot.hash(sk);
+ return;
+ }
+ local_bh_disable();
+ __tcp_v6_hash(sk);
+ local_bh_enable();
+ }
+}
+
+static struct sock *tcp_v6_lookup_listener(struct in6_addr *daddr, unsigned short hnum, int dif)
+{
+ struct sock *sk;
+ struct hlist_node *node;
+ struct sock *result = NULL;
+ int score, hiscore;
+
+ hiscore=0;
+ read_lock(&tcp_lhash_lock);
+ sk_for_each(sk, node, &tcp_listening_hash[tcp_lhashfn(hnum)]) {
+ if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ score = 1;
+ if (!ipv6_addr_any(&np->rcv_saddr)) {
+ if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
+ continue;
+ score++;
+ }
+ if (sk->sk_bound_dev_if) {
+ if (sk->sk_bound_dev_if != dif)
+ continue;
+ score++;
+ }
+ if (score == 3) {
+ result = sk;
+ break;
+ }
+ if (score > hiscore) {
+ hiscore = score;
+ result = sk;
+ }
+ }
+ }
+ if (result)
+ sock_hold(result);
+ read_unlock(&tcp_lhash_lock);
+ return result;
+}
+
+/* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
+ * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
+ *
+ * The sockhash lock must be held as a reader here.
+ */
+
+static inline struct sock *__tcp_v6_lookup_established(struct in6_addr *saddr, u16 sport,
+ struct in6_addr *daddr, u16 hnum,
+ int dif)
+{
+ struct tcp_ehash_bucket *head;
+ struct sock *sk;
+ struct hlist_node *node;
+ __u32 ports = TCP_COMBINED_PORTS(sport, hnum);
+ int hash;
+
+ /* Optimize here for direct hit, only listening connections can
+ * have wildcards anyways.
+ */
+ hash = tcp_v6_hashfn(daddr, hnum, saddr, sport);
+ head = &tcp_ehash[hash];
+ read_lock(&head->lock);
+ sk_for_each(sk, node, &head->chain) {
+ /* For IPV6 do the cheaper port and family tests first. */
+ if(TCP_IPV6_MATCH(sk, saddr, daddr, ports, dif))
+ goto hit; /* You sunk my battleship! */
+ }
+ /* Must check for a TIME_WAIT'er before going to listener hash. */
+ sk_for_each(sk, node, &(head + tcp_ehash_size)->chain) {
+ /* FIXME: acme: check this... */
+ struct tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk;
+
+ if(*((__u32 *)&(tw->tw_dport)) == ports &&
+ sk->sk_family == PF_INET6) {
+ if(ipv6_addr_equal(&tw->tw_v6_daddr, saddr) &&
+ ipv6_addr_equal(&tw->tw_v6_rcv_saddr, daddr) &&
+ (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
+ goto hit;
+ }
+ }
+ read_unlock(&head->lock);
+ return NULL;
+
+hit:
+ sock_hold(sk);
+ read_unlock(&head->lock);
+ return sk;
+}
+
+
+static inline struct sock *__tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
+ struct in6_addr *daddr, u16 hnum,
+ int dif)
+{
+ struct sock *sk;
+
+ sk = __tcp_v6_lookup_established(saddr, sport, daddr, hnum, dif);
+
+ if (sk)
+ return sk;
+
+ return tcp_v6_lookup_listener(daddr, hnum, dif);
+}
+
+inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
+ struct in6_addr *daddr, u16 dport,
+ int dif)
+{
+ struct sock *sk;
+
+ local_bh_disable();
+ sk = __tcp_v6_lookup(saddr, sport, daddr, ntohs(dport), dif);
+ local_bh_enable();
+
+ return sk;
+}
+
+EXPORT_SYMBOL_GPL(tcp_v6_lookup);
+
+
+/*
+ * Open request hash tables.
+ */
+
+static u32 tcp_v6_synq_hash(struct in6_addr *raddr, u16 rport, u32 rnd)
+{
+ u32 a, b, c;
+
+ a = raddr->s6_addr32[0];
+ b = raddr->s6_addr32[1];
+ c = raddr->s6_addr32[2];
+
+ a += JHASH_GOLDEN_RATIO;
+ b += JHASH_GOLDEN_RATIO;
+ c += rnd;
+ __jhash_mix(a, b, c);
+
+ a += raddr->s6_addr32[3];
+ b += (u32) rport;
+ __jhash_mix(a, b, c);
+
+ return c & (TCP_SYNQ_HSIZE - 1);
+}
+
+static struct open_request *tcp_v6_search_req(struct tcp_sock *tp,
+ struct open_request ***prevp,
+ __u16 rport,
+ struct in6_addr *raddr,
+ struct in6_addr *laddr,
+ int iif)
+{
+ struct tcp_listen_opt *lopt = tp->listen_opt;
+ struct open_request *req, **prev;
+
+ for (prev = &lopt->syn_table[tcp_v6_synq_hash(raddr, rport, lopt->hash_rnd)];
+ (req = *prev) != NULL;
+ prev = &req->dl_next) {
+ if (req->rmt_port == rport &&
+ req->class->family == AF_INET6 &&
+ ipv6_addr_equal(&req->af.v6_req.rmt_addr, raddr) &&
+ ipv6_addr_equal(&req->af.v6_req.loc_addr, laddr) &&
+ (!req->af.v6_req.iif || req->af.v6_req.iif == iif)) {
+ BUG_TRAP(req->sk == NULL);
+ *prevp = prev;
+ return req;
+ }
+ }
+
+ return NULL;
+}
+
+static __inline__ u16 tcp_v6_check(struct tcphdr *th, int len,
+ struct in6_addr *saddr,
+ struct in6_addr *daddr,
+ unsigned long base)
+{
+ return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
+}
+
+static __u32 tcp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
+{
+ if (skb->protocol == htons(ETH_P_IPV6)) {
+ return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
+ skb->nh.ipv6h->saddr.s6_addr32,
+ skb->h.th->dest,
+ skb->h.th->source);
+ } else {
+ return secure_tcp_sequence_number(skb->nh.iph->daddr,
+ skb->nh.iph->saddr,
+ skb->h.th->dest,
+ skb->h.th->source);
+ }
+}
+
+static int __tcp_v6_check_established(struct sock *sk, __u16 lport,
+ struct tcp_tw_bucket **twp)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *daddr = &np->rcv_saddr;
+ struct in6_addr *saddr = &np->daddr;
+ int dif = sk->sk_bound_dev_if;
+ u32 ports = TCP_COMBINED_PORTS(inet->dport, lport);
+ int hash = tcp_v6_hashfn(daddr, inet->num, saddr, inet->dport);
+ struct tcp_ehash_bucket *head = &tcp_ehash[hash];
+ struct sock *sk2;
+ struct hlist_node *node;
+ struct tcp_tw_bucket *tw;
+
+ write_lock(&head->lock);
+
+ /* Check TIME-WAIT sockets first. */
+ sk_for_each(sk2, node, &(head + tcp_ehash_size)->chain) {
+ tw = (struct tcp_tw_bucket*)sk2;
+
+ if(*((__u32 *)&(tw->tw_dport)) == ports &&
+ sk2->sk_family == PF_INET6 &&
+ ipv6_addr_equal(&tw->tw_v6_daddr, saddr) &&
+ ipv6_addr_equal(&tw->tw_v6_rcv_saddr, daddr) &&
+ sk2->sk_bound_dev_if == sk->sk_bound_dev_if) {
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ if (tw->tw_ts_recent_stamp &&
+ (!twp || (sysctl_tcp_tw_reuse &&
+ xtime.tv_sec -
+ tw->tw_ts_recent_stamp > 1))) {
+ /* See comment in tcp_ipv4.c */
+ tp->write_seq = tw->tw_snd_nxt + 65535 + 2;
+ if (!tp->write_seq)
+ tp->write_seq = 1;
+ tp->rx_opt.ts_recent = tw->tw_ts_recent;
+ tp->rx_opt.ts_recent_stamp = tw->tw_ts_recent_stamp;
+ sock_hold(sk2);
+ goto unique;
+ } else
+ goto not_unique;
+ }
+ }
+ tw = NULL;
+
+ /* And established part... */
+ sk_for_each(sk2, node, &head->chain) {
+ if(TCP_IPV6_MATCH(sk2, saddr, daddr, ports, dif))
+ goto not_unique;
+ }
+
+unique:
+ BUG_TRAP(sk_unhashed(sk));
+ __sk_add_node(sk, &head->chain);
+ sk->sk_hashent = hash;
+ sock_prot_inc_use(sk->sk_prot);
+ write_unlock(&head->lock);
+
+ if (twp) {
+ *twp = tw;
+ NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
+ } else if (tw) {
+ /* Silly. Should hash-dance instead... */
+ tcp_tw_deschedule(tw);
+ NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
+
+ tcp_tw_put(tw);
+ }
+ return 0;
+
+not_unique:
+ write_unlock(&head->lock);
+ return -EADDRNOTAVAIL;
+}
+
+static inline u32 tcpv6_port_offset(const struct sock *sk)
+{
+ const struct inet_sock *inet = inet_sk(sk);
+ const struct ipv6_pinfo *np = inet6_sk(sk);
+
+ return secure_tcpv6_port_ephemeral(np->rcv_saddr.s6_addr32,
+ np->daddr.s6_addr32,
+ inet->dport);
+}
+
+static int tcp_v6_hash_connect(struct sock *sk)
+{
+ unsigned short snum = inet_sk(sk)->num;
+ struct tcp_bind_hashbucket *head;
+ struct tcp_bind_bucket *tb;
+ int ret;
+
+ if (!snum) {
+ int low = sysctl_local_port_range[0];
+ int high = sysctl_local_port_range[1];
+ int range = high - low;
+ int i;
+ int port;
+ static u32 hint;
+ u32 offset = hint + tcpv6_port_offset(sk);
+ struct hlist_node *node;
+ struct tcp_tw_bucket *tw = NULL;
+
+ local_bh_disable();
+ for (i = 1; i <= range; i++) {
+ port = low + (i + offset) % range;
+ head = &tcp_bhash[tcp_bhashfn(port)];
+ spin_lock(&head->lock);
+
+ /* Does not bother with rcv_saddr checks,
+ * because the established check is already
+ * unique enough.
+ */
+ tb_for_each(tb, node, &head->chain) {
+ if (tb->port == port) {
+ BUG_TRAP(!hlist_empty(&tb->owners));
+ if (tb->fastreuse >= 0)
+ goto next_port;
+ if (!__tcp_v6_check_established(sk,
+ port,
+ &tw))
+ goto ok;
+ goto next_port;
+ }
+ }
+
+ tb = tcp_bucket_create(head, port);
+ if (!tb) {
+ spin_unlock(&head->lock);
+ break;
+ }
+ tb->fastreuse = -1;
+ goto ok;
+
+ next_port:
+ spin_unlock(&head->lock);
+ }
+ local_bh_enable();
+
+ return -EADDRNOTAVAIL;
+
+ok:
+ hint += i;
+
+ /* Head lock still held and bh's disabled */
+ tcp_bind_hash(sk, tb, port);
+ if (sk_unhashed(sk)) {
+ inet_sk(sk)->sport = htons(port);
+ __tcp_v6_hash(sk);
+ }
+ spin_unlock(&head->lock);
+
+ if (tw) {
+ tcp_tw_deschedule(tw);
+ tcp_tw_put(tw);
+ }
+
+ ret = 0;
+ goto out;
+ }
+
+ head = &tcp_bhash[tcp_bhashfn(snum)];
+ tb = tcp_sk(sk)->bind_hash;
+ spin_lock_bh(&head->lock);
+
+ if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
+ __tcp_v6_hash(sk);
+ spin_unlock_bh(&head->lock);
+ return 0;
+ } else {
+ spin_unlock(&head->lock);
+ /* No definite answer... Walk to established hash table */
+ ret = __tcp_v6_check_established(sk, snum, NULL);
+out:
+ local_bh_enable();
+ return ret;
+ }
+}
+
+static __inline__ int tcp_v6_iif(struct sk_buff *skb)
+{
+ return IP6CB(skb)->iif;
+}
+
+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 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 = tp->ext_header_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];
+
+ tp->af_specific = &ipv6_mapped;
+ sk->sk_backlog_rcv = tcp_v4_do_rcv;
+
+ err = tcp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
+
+ if (err) {
+ tp->ext_header_len = exthdrlen;
+ tp->af_specific = &ipv6_specific;
+ sk->sk_backlog_rcv = tcp_v6_do_rcv;
+ 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;
+ }
+
+ 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, 0)) < 0) {
+ dst_release(dst);
+ 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;
+
+ ip6_dst_store(sk, dst, NULL);
+ sk->sk_route_caps = dst->dev->features &
+ ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
+
+ tp->ext_header_len = 0;
+ if (np->opt)
+ tp->ext_header_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 = tcp_v6_hash_connect(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, __u32 info)
+{
+ struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
+ struct tcphdr *th = (struct tcphdr *)(skb->data+offset);
+ struct ipv6_pinfo *np;
+ struct sock *sk;
+ int err;
+ struct tcp_sock *tp;
+ __u32 seq;
+
+ sk = tcp_v6_lookup(&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) {
+ tcp_tw_put((struct tcp_tw_bucket*)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;
+
+ 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 (tp->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 open_request */
+ switch (sk->sk_state) {
+ struct open_request *req, **prev;
+ case TCP_LISTEN:
+ if (sock_owned_by_user(sk))
+ goto out;
+
+ req = tcp_v6_search_req(tp, &prev, th->dest, &hdr->daddr,
+ &hdr->saddr, tcp_v6_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 != req->snt_isn) {
+ NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
+ goto out;
+ }
+
+ tcp_synq_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)) {
+ TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS);
+ 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 open_request *req,
+ struct dst_entry *dst)
+{
+ 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;
+ int err = -1;
+
+ memset(&fl, 0, sizeof(fl));
+ fl.proto = IPPROTO_TCP;
+ ipv6_addr_copy(&fl.fl6_dst, &req->af.v6_req.rmt_addr);
+ ipv6_addr_copy(&fl.fl6_src, &req->af.v6_req.loc_addr);
+ fl.fl6_flowlabel = 0;
+ fl.oif = req->af.v6_req.iif;
+ fl.fl_ip_dport = req->rmt_port;
+ fl.fl_ip_sport = inet_sk(sk)->sport;
+
+ if (dst == NULL) {
+ opt = np->opt;
+ if (opt == NULL &&
+ np->rxopt.bits.srcrt == 2 &&
+ req->af.v6_req.pktopts) {
+ struct sk_buff *pktopts = req->af.v6_req.pktopts;
+ struct inet6_skb_parm *rxopt = IP6CB(pktopts);
+ if (rxopt->srcrt)
+ opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(pktopts->nh.raw + rxopt->srcrt));
+ }
+
+ 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 = skb->h.th;
+
+ th->check = tcp_v6_check(th, skb->len,
+ &req->af.v6_req.loc_addr, &req->af.v6_req.rmt_addr,
+ csum_partial((char *)th, skb->len, skb->csum));
+
+ ipv6_addr_copy(&fl.fl6_dst, &req->af.v6_req.rmt_addr);
+ err = ip6_xmit(sk, skb, &fl, opt, 0);
+ if (err == NET_XMIT_CN)
+ err = 0;
+ }
+
+done:
+ dst_release(dst);
+ if (opt && opt != np->opt)
+ sock_kfree_s(sk, opt, opt->tot_len);
+ return err;
+}
+
+static void tcp_v6_or_free(struct open_request *req)
+{
+ if (req->af.v6_req.pktopts)
+ kfree_skb(req->af.v6_req.pktopts);
+}
+
+static struct or_calltable or_ipv6 = {
+ .family = AF_INET6,
+ .rtx_syn_ack = tcp_v6_send_synack,
+ .send_ack = tcp_v6_or_send_ack,
+ .destructor = tcp_v6_or_free,
+ .send_reset = tcp_v6_send_reset
+};
+
+static int ipv6_opt_accepted(struct sock *sk, struct sk_buff *skb)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+
+ if (np->rxopt.all) {
+ if ((opt->hop && np->rxopt.bits.hopopts) ||
+ ((IPV6_FLOWINFO_MASK&*(u32*)skb->nh.raw) &&
+ np->rxopt.bits.rxflow) ||
+ (opt->srcrt && np->rxopt.bits.srcrt) ||
+ ((opt->dst1 || opt->dst0) && np->rxopt.bits.dstopts))
+ return 1;
+ }
+ return 0;
+}
+
+
+static void tcp_v6_send_check(struct sock *sk, struct tcphdr *th, int len,
+ struct sk_buff *skb)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ if (skb->ip_summed == CHECKSUM_HW) {
+ th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 0);
+ skb->csum = 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 void tcp_v6_send_reset(struct sk_buff *skb)
+{
+ struct tcphdr *th = skb->h.th, *t1;
+ struct sk_buff *buff;
+ struct flowi fl;
+
+ if (th->rst)
+ return;
+
+ if (!ipv6_unicast_destination(skb))
+ return;
+
+ /*
+ * 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) + sizeof(struct tcphdr),
+ GFP_ATOMIC);
+ if (buff == NULL)
+ return;
+
+ skb_reserve(buff, MAX_HEADER + sizeof(struct ipv6hdr) + sizeof(struct tcphdr));
+
+ t1 = (struct tcphdr *) skb_push(buff,sizeof(struct tcphdr));
+
+ /* Swap the send and the receive. */
+ memset(t1, 0, sizeof(*t1));
+ t1->dest = th->source;
+ t1->source = th->dest;
+ t1->doff = sizeof(*t1)/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));
+ }
+
+ buff->csum = csum_partial((char *)t1, sizeof(*t1), 0);
+
+ memset(&fl, 0, sizeof(fl));
+ ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr);
+ ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr);
+
+ t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
+ sizeof(*t1), IPPROTO_TCP,
+ buff->csum);
+
+ fl.proto = IPPROTO_TCP;
+ fl.oif = tcp_v6_iif(skb);
+ fl.fl_ip_dport = t1->dest;
+ fl.fl_ip_sport = t1->source;
+
+ /* sk = NULL, but it is safe for now. RST socket required. */
+ if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
+
+ if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) {
+ dst_release(buff->dst);
+ return;
+ }
+
+ ip6_xmit(NULL, 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 sk_buff *skb, u32 seq, u32 ack, u32 win, u32 ts)
+{
+ struct tcphdr *th = skb->h.th, *t1;
+ struct sk_buff *buff;
+ struct flowi fl;
+ int tot_len = sizeof(struct tcphdr);
+
+ if (ts)
+ tot_len += 3*4;
+
+ 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);
+
+ if (ts) {
+ u32 *ptr = (u32*)(t1 + 1);
+ *ptr++ = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+ (TCPOPT_TIMESTAMP << 8) | TCPOLEN_TIMESTAMP);
+ *ptr++ = htonl(tcp_time_stamp);
+ *ptr = htonl(ts);
+ }
+
+ buff->csum = csum_partial((char *)t1, tot_len, 0);
+
+ memset(&fl, 0, sizeof(fl));
+ ipv6_addr_copy(&fl.fl6_dst, &skb->nh.ipv6h->saddr);
+ ipv6_addr_copy(&fl.fl6_src, &skb->nh.ipv6h->daddr);
+
+ t1->check = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
+ tot_len, IPPROTO_TCP,
+ buff->csum);
+
+ fl.proto = IPPROTO_TCP;
+ fl.oif = tcp_v6_iif(skb);
+ fl.fl_ip_dport = t1->dest;
+ fl.fl_ip_sport = t1->source;
+
+ if (!ip6_dst_lookup(NULL, &buff->dst, &fl)) {
+ if ((xfrm_lookup(&buff->dst, &fl, NULL, 0)) < 0) {
+ dst_release(buff->dst);
+ return;
+ }
+ ip6_xmit(NULL, 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 tcp_tw_bucket *tw = (struct tcp_tw_bucket *)sk;
+
+ tcp_v6_send_ack(skb, tw->tw_snd_nxt, tw->tw_rcv_nxt,
+ tw->tw_rcv_wnd >> tw->tw_rcv_wscale, tw->tw_ts_recent);
+
+ tcp_tw_put(tw);
+}
+
+static void tcp_v6_or_send_ack(struct sk_buff *skb, struct open_request *req)
+{
+ tcp_v6_send_ack(skb, req->snt_isn+1, 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 open_request *req, **prev;
+ struct tcphdr *th = skb->h.th;
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct sock *nsk;
+
+ /* Find possible connection requests. */
+ req = tcp_v6_search_req(tp, &prev, th->source, &skb->nh.ipv6h->saddr,
+ &skb->nh.ipv6h->daddr, tcp_v6_iif(skb));
+ if (req)
+ return tcp_check_req(sk, skb, req, prev);
+
+ nsk = __tcp_v6_lookup_established(&skb->nh.ipv6h->saddr,
+ th->source,
+ &skb->nh.ipv6h->daddr,
+ ntohs(th->dest),
+ tcp_v6_iif(skb));
+
+ if (nsk) {
+ if (nsk->sk_state != TCP_TIME_WAIT) {
+ bh_lock_sock(nsk);
+ return nsk;
+ }
+ tcp_tw_put((struct tcp_tw_bucket*)nsk);
+ return NULL;
+ }
+
+#if 0 /*def CONFIG_SYN_COOKIES*/
+ if (!th->rst && !th->syn && th->ack)
+ sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
+#endif
+ return sk;
+}
+
+static void tcp_v6_synq_add(struct sock *sk, struct open_request *req)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct tcp_listen_opt *lopt = tp->listen_opt;
+ u32 h = tcp_v6_synq_hash(&req->af.v6_req.rmt_addr, req->rmt_port, lopt->hash_rnd);
+
+ req->sk = NULL;
+ req->expires = jiffies + TCP_TIMEOUT_INIT;
+ req->retrans = 0;
+ req->dl_next = lopt->syn_table[h];
+
+ write_lock(&tp->syn_wait_lock);
+ lopt->syn_table[h] = req;
+ write_unlock(&tp->syn_wait_lock);
+
+ tcp_synq_added(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 ipv6_pinfo *np = inet6_sk(sk);
+ struct tcp_options_received tmp_opt;
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct open_request *req = NULL;
+ __u32 isn = TCP_SKB_CB(skb)->when;
+
+ if (skb->protocol == htons(ETH_P_IP))
+ return tcp_v4_conn_request(sk, skb);
+
+ if (!ipv6_unicast_destination(skb))
+ goto drop;
+
+ /*
+ * There are no SYN attacks on IPv6, yet...
+ */
+ if (tcp_synq_is_full(sk) && !isn) {
+ if (net_ratelimit())
+ printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
+ goto drop;
+ }
+
+ if (sk_acceptq_is_full(sk) && tcp_synq_young(sk) > 1)
+ goto drop;
+
+ req = tcp_openreq_alloc();
+ if (req == NULL)
+ goto drop;
+
+ 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);
+
+ tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
+ tcp_openreq_init(req, &tmp_opt, skb);
+
+ req->class = &or_ipv6;
+ ipv6_addr_copy(&req->af.v6_req.rmt_addr, &skb->nh.ipv6h->saddr);
+ ipv6_addr_copy(&req->af.v6_req.loc_addr, &skb->nh.ipv6h->daddr);
+ TCP_ECN_create_request(req, skb->h.th);
+ req->af.v6_req.pktopts = NULL;
+ if (ipv6_opt_accepted(sk, skb) ||
+ np->rxopt.bits.rxinfo ||
+ np->rxopt.bits.rxhlim) {
+ atomic_inc(&skb->users);
+ req->af.v6_req.pktopts = skb;
+ }
+ req->af.v6_req.iif = sk->sk_bound_dev_if;
+
+ /* So that link locals have meaning */
+ if (!sk->sk_bound_dev_if &&
+ ipv6_addr_type(&req->af.v6_req.rmt_addr) & IPV6_ADDR_LINKLOCAL)
+ req->af.v6_req.iif = tcp_v6_iif(skb);
+
+ if (isn == 0)
+ isn = tcp_v6_init_sequence(sk,skb);
+
+ req->snt_isn = isn;
+
+ if (tcp_v6_send_synack(sk, req, NULL))
+ goto drop;
+
+ tcp_v6_synq_add(sk, req);
+
+ return 0;
+
+drop:
+ if (req)
+ tcp_openreq_free(req);
+
+ TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS);
+ return 0; /* don't send reset */
+}
+
+static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
+ struct open_request *req,
+ struct dst_entry *dst)
+{
+ 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;
+
+ 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);
+
+ newtp->af_specific = &ipv6_mapped;
+ newsk->sk_backlog_rcv = tcp_v4_do_rcv;
+ newnp->pktoptions = NULL;
+ newnp->opt = NULL;
+ newnp->mcast_oif = tcp_v6_iif(skb);
+ newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
+
+ /* Charge newly allocated IPv6 socket. Though it is mapped,
+ * it is IPv6 yet.
+ */
+#ifdef INET_REFCNT_DEBUG
+ atomic_inc(&inet6_sock_nr);
+#endif
+
+ /* It is tricky place. Until this moment IPv4 tcp
+ worked with IPv6 af_tcp.af_specific.
+ Sync it now.
+ */
+ tcp_sync_mss(newsk, newtp->pmtu_cookie);
+
+ return newsk;
+ }
+
+ opt = np->opt;
+
+ if (sk_acceptq_is_full(sk))
+ goto out_overflow;
+
+ if (np->rxopt.bits.srcrt == 2 &&
+ opt == NULL && req->af.v6_req.pktopts) {
+ struct inet6_skb_parm *rxopt = IP6CB(req->af.v6_req.pktopts);
+ if (rxopt->srcrt)
+ opt = ipv6_invert_rthdr(sk, (struct ipv6_rt_hdr*)(req->af.v6_req.pktopts->nh.raw+rxopt->srcrt));
+ }
+
+ 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, &req->af.v6_req.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, &req->af.v6_req.loc_addr);
+ fl.oif = sk->sk_bound_dev_if;
+ fl.fl_ip_dport = req->rmt_port;
+ fl.fl_ip_sport = inet_sk(sk)->sport;
+
+ 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;
+
+ /* Charge newly allocated IPv6 socket */
+#ifdef INET_REFCNT_DEBUG
+ atomic_inc(&inet6_sock_nr);
+#endif
+
+ ip6_dst_store(newsk, dst, NULL);
+ newsk->sk_route_caps = dst->dev->features &
+ ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
+
+ 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, &req->af.v6_req.rmt_addr);
+ ipv6_addr_copy(&newnp->saddr, &req->af.v6_req.loc_addr);
+ ipv6_addr_copy(&newnp->rcv_saddr, &req->af.v6_req.loc_addr);
+ newsk->sk_bound_dev_if = req->af.v6_req.iif;
+
+ /* Now IPv6 options...
+
+ First: no IPv4 options.
+ */
+ newinet->opt = NULL;
+
+ /* Clone RX bits */
+ newnp->rxopt.all = np->rxopt.all;
+
+ /* Clone pktoptions received with SYN */
+ newnp->pktoptions = NULL;
+ if (req->af.v6_req.pktopts) {
+ newnp->pktoptions = skb_clone(req->af.v6_req.pktopts,
+ GFP_ATOMIC);
+ kfree_skb(req->af.v6_req.pktopts);
+ req->af.v6_req.pktopts = NULL;
+ if (newnp->pktoptions)
+ skb_set_owner_r(newnp->pktoptions, newsk);
+ }
+ newnp->opt = NULL;
+ newnp->mcast_oif = tcp_v6_iif(skb);
+ newnp->mcast_hops = skb->nh.ipv6h->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);
+ }
+
+ newtp->ext_header_len = 0;
+ if (newnp->opt)
+ newtp->ext_header_len = newnp->opt->opt_nflen +
+ newnp->opt->opt_flen;
+
+ 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;
+
+ __tcp_v6_hash(newsk);
+ tcp_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 int tcp_v6_checksum_init(struct sk_buff *skb)
+{
+ if (skb->ip_summed == CHECKSUM_HW) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ if (!tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
+ &skb->nh.ipv6h->daddr,skb->csum))
+ return 0;
+ LIMIT_NETDEBUG(printk(KERN_DEBUG "hw tcp v6 csum failed\n"));
+ }
+ if (skb->len <= 76) {
+ if (tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
+ &skb->nh.ipv6h->daddr,skb_checksum(skb, 0, skb->len, 0)))
+ return -1;
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else {
+ skb->csum = ~tcp_v6_check(skb->h.th,skb->len,&skb->nh.ipv6h->saddr,
+ &skb->nh.ipv6h->daddr,0);
+ }
+ 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);
+
+ if (sk_filter(sk, skb, 0))
+ 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, skb->h.th, skb->len))
+ goto reset;
+ TCP_CHECK_TIMER(sk);
+ if (opt_skb)
+ goto ipv6_pktoptions;
+ return 0;
+ }
+
+ if (skb->len < (skb->h.th->doff<<2) || 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, skb->h.th, skb->len))
+ goto reset;
+ TCP_CHECK_TIMER(sk);
+ if (opt_skb)
+ goto ipv6_pktoptions;
+ return 0;
+
+reset:
+ tcp_v6_send_reset(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->mcast_oif = tcp_v6_iif(opt_skb);
+ if (np->rxopt.bits.rxhlim)
+ np->mcast_hops = opt_skb->nh.ipv6h->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 **pskb, unsigned int *nhoffp)
+{
+ struct sk_buff *skb = *pskb;
+ 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 = skb->h.th;
+
+ if (th->doff < sizeof(struct tcphdr)/4)
+ goto bad_packet;
+ if (!pskb_may_pull(skb, th->doff*4))
+ goto discard_it;
+
+ if ((skb->ip_summed != CHECKSUM_UNNECESSARY &&
+ tcp_v6_checksum_init(skb) < 0))
+ goto bad_packet;
+
+ th = skb->h.th;
+ 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(skb->nh.ipv6h);
+ TCP_SKB_CB(skb)->sacked = 0;
+
+ sk = __tcp_v6_lookup(&skb->nh.ipv6h->saddr, th->source,
+ &skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_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, 0))
+ goto discard_and_relse;
+
+ skb->dev = NULL;
+
+ bh_lock_sock(sk);
+ ret = 0;
+ if (!sock_owned_by_user(sk)) {
+ 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(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)) {
+ tcp_tw_put((struct tcp_tw_bucket *) sk);
+ goto discard_it;
+ }
+
+ if (skb->len < (th->doff<<2) || tcp_checksum_complete(skb)) {
+ TCP_INC_STATS_BH(TCP_MIB_INERRS);
+ tcp_tw_put((struct tcp_tw_bucket *) sk);
+ goto discard_it;
+ }
+
+ switch(tcp_timewait_state_process((struct tcp_tw_bucket *)sk,
+ skb, th, skb->len)) {
+ case TCP_TW_SYN:
+ {
+ struct sock *sk2;
+
+ sk2 = tcp_v6_lookup_listener(&skb->nh.ipv6h->daddr, ntohs(th->dest), tcp_v6_iif(skb));
+ if (sk2 != NULL) {
+ tcp_tw_deschedule((struct tcp_tw_bucket *)sk);
+ tcp_tw_put((struct tcp_tw_bucket *)sk);
+ 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_rebuild_header(struct sock *sk)
+{
+ int err;
+ struct dst_entry *dst;
+ struct ipv6_pinfo *np = inet6_sk(sk);
+
+ dst = __sk_dst_check(sk, np->dst_cookie);
+
+ if (dst == NULL) {
+ struct inet_sock *inet = inet_sk(sk);
+ 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, &np->daddr);
+ ipv6_addr_copy(&fl.fl6_src, &np->saddr);
+ fl.fl6_flowlabel = np->flow_label;
+ fl.oif = sk->sk_bound_dev_if;
+ fl.fl_ip_dport = inet->dport;
+ 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;
+ }
+
+ err = ip6_dst_lookup(sk, &dst, &fl);
+ if (err) {
+ sk->sk_route_caps = 0;
+ return err;
+ }
+ if (final_p)
+ ipv6_addr_copy(&fl.fl6_dst, final_p);
+
+ if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
+ sk->sk_err_soft = -err;
+ dst_release(dst);
+ return err;
+ }
+
+ ip6_dst_store(sk, dst, NULL);
+ sk->sk_route_caps = dst->dev->features &
+ ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
+ }
+
+ return 0;
+}
+
+static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok)
+{
+ struct sock *sk = skb->sk;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct flowi fl;
+ struct dst_entry *dst;
+ struct in6_addr *final_p = NULL, final;
+
+ 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.fl6_flowlabel = np->flow_label;
+ IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
+ fl.oif = sk->sk_bound_dev_if;
+ fl.fl_ip_sport = inet->sport;
+ fl.fl_ip_dport = inet->dport;
+
+ 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;
+ }
+
+ dst = __sk_dst_check(sk, np->dst_cookie);
+
+ if (dst == NULL) {
+ int err = ip6_dst_lookup(sk, &dst, &fl);
+
+ if (err) {
+ sk->sk_err_soft = -err;
+ return err;
+ }
+
+ if (final_p)
+ ipv6_addr_copy(&fl.fl6_dst, final_p);
+
+ if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) {
+ sk->sk_route_caps = 0;
+ dst_release(dst);
+ return err;
+ }
+
+ ip6_dst_store(sk, dst, NULL);
+ sk->sk_route_caps = dst->dev->features &
+ ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
+ }
+
+ skb->dst = dst_clone(dst);
+
+ /* Restore final destination back after routing done */
+ ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
+
+ return ip6_xmit(sk, skb, &fl, np->opt, 0);
+}
+
+static void v6_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
+
+ sin6->sin6_family = AF_INET6;
+ ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
+ sin6->sin6_port = inet_sk(sk)->dport;
+ /* We do not store received flowlabel for TCP */
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+ if (sk->sk_bound_dev_if &&
+ ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ sin6->sin6_scope_id = sk->sk_bound_dev_if;
+}
+
+static int tcp_v6_remember_stamp(struct sock *sk)
+{
+ /* Alas, not yet... */
+ return 0;
+}
+
+static struct tcp_func ipv6_specific = {
+ .queue_xmit = tcp_v6_xmit,
+ .send_check = tcp_v6_send_check,
+ .rebuild_header = tcp_v6_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 = v6_addr2sockaddr,
+ .sockaddr_len = sizeof(struct sockaddr_in6)
+};
+
+/*
+ * TCP over IPv4 via INET6 API
+ */
+
+static struct tcp_func ipv6_mapped = {
+ .queue_xmit = ip_queue_xmit,
+ .send_check = tcp_v4_send_check,
+ .rebuild_header = tcp_v4_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 = v6_addr2sockaddr,
+ .sockaddr_len = sizeof(struct sockaddr_in6)
+};
+
+
+
+/* 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 tcp_sock *tp = tcp_sk(sk);
+
+ skb_queue_head_init(&tp->out_of_order_queue);
+ tcp_init_xmit_timers(sk);
+ tcp_prequeue_init(tp);
+
+ tp->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_std = tp->mss_cache = 536;
+
+ tp->reordering = sysctl_tcp_reordering;
+
+ sk->sk_state = TCP_CLOSE;
+
+ tp->af_specific = &ipv6_specific;
+
+ sk->sk_write_space = sk_stream_write_space;
+ sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
+
+ 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)
+{
+ extern int tcp_v4_destroy_sock(struct sock *sk);
+
+ tcp_v4_destroy_sock(sk);
+ return inet6_destroy_sock(sk);
+}
+
+/* Proc filesystem TCPv6 sock list dumping. */
+static void get_openreq6(struct seq_file *seq,
+ struct sock *sk, struct open_request *req, int i, int uid)
+{
+ struct in6_addr *dest, *src;
+ int ttd = req->expires - jiffies;
+
+ if (ttd < 0)
+ ttd = 0;
+
+ src = &req->af.v6_req.loc_addr;
+ dest = &req->af.v6_req.rmt_addr;
+ 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(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);
+ struct ipv6_pinfo *np = inet6_sk(sp);
+
+ dest = &np->daddr;
+ src = &np->rcv_saddr;
+ destp = ntohs(inet->dport);
+ srcp = ntohs(inet->sport);
+ if (tp->pending == TCP_TIME_RETRANS) {
+ timer_active = 1;
+ timer_expires = tp->timeout;
+ } else if (tp->pending == TCP_TIME_PROBE0) {
+ timer_active = 4;
+ timer_expires = tp->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, tp->rcv_nxt-tp->copied_seq,
+ timer_active,
+ jiffies_to_clock_t(timer_expires - jiffies),
+ tp->retransmits,
+ sock_i_uid(sp),
+ tp->probes_out,
+ sock_i_ino(sp),
+ atomic_read(&sp->sk_refcnt), sp,
+ tp->rto, tp->ack.ato, (tp->ack.quick<<1)|tp->ack.pingpong,
+ tp->snd_cwnd, tp->snd_ssthresh>=0xFFFF?-1:tp->snd_ssthresh
+ );
+}
+
+static void get_timewait6_sock(struct seq_file *seq,
+ struct tcp_tw_bucket *tw, int i)
+{
+ struct in6_addr *dest, *src;
+ __u16 destp, srcp;
+ int ttd = tw->tw_ttd - jiffies;
+
+ if (ttd < 0)
+ ttd = 0;
+
+ dest = &tw->tw_v6_daddr;
+ src = &tw->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);
+}
+
+#ifdef CONFIG_PROC_FS
+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 file_operations tcp6_seq_fops;
+static struct tcp_seq_afinfo tcp6_seq_afinfo = {
+ .owner = THIS_MODULE,
+ .name = "tcp6",
+ .family = AF_INET6,
+ .seq_show = tcp6_seq_show,
+ .seq_fops = &tcp6_seq_fops,
+};
+
+int __init tcp6_proc_init(void)
+{
+ return tcp_proc_register(&tcp6_seq_afinfo);
+}
+
+void tcp6_proc_exit(void)
+{
+ tcp_proc_unregister(&tcp6_seq_afinfo);
+}
+#endif
+
+struct proto tcpv6_prot = {
+ .name = "TCPv6",
+ .owner = THIS_MODULE,
+ .close = tcp_close,
+ .connect = tcp_v6_connect,
+ .disconnect = tcp_disconnect,
+ .accept = tcp_accept,
+ .ioctl = tcp_ioctl,
+ .init = tcp_v6_init_sock,
+ .destroy = tcp_v6_destroy_sock,
+ .shutdown = tcp_shutdown,
+ .setsockopt = tcp_setsockopt,
+ .getsockopt = tcp_getsockopt,
+ .sendmsg = tcp_sendmsg,
+ .recvmsg = tcp_recvmsg,
+ .backlog_rcv = tcp_v6_do_rcv,
+ .hash = tcp_v6_hash,
+ .unhash = tcp_unhash,
+ .get_port = tcp_v6_get_port,
+ .enter_memory_pressure = tcp_enter_memory_pressure,
+ .sockets_allocated = &tcp_sockets_allocated,
+ .memory_allocated = &tcp_memory_allocated,
+ .memory_pressure = &tcp_memory_pressure,
+ .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),
+};
+
+static struct inet6_protocol tcpv6_protocol = {
+ .handler = tcp_v6_rcv,
+ .err_handler = tcp_v6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+extern struct proto_ops inet6_stream_ops;
+
+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,
+};
+
+void __init tcpv6_init(void)
+{
+ /* register inet6 protocol */
+ if (inet6_add_protocol(&tcpv6_protocol, IPPROTO_TCP) < 0)
+ printk(KERN_ERR "tcpv6_init: Could not register protocol\n");
+ inet6_register_protosw(&tcpv6_protosw);
+}
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-04 01:53:16 +0000