* a single port at the same time.
*/
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <net/transp_v6.h>
#include <net/ipv6.h>
#include <net/inet_common.h>
+#include <net/timewait_sock.h>
#include <net/xfrm.h>
+#include <net/netdma.h>
#include <linux/inet.h>
#include <linux/ipv6.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
-int sysctl_tcp_tw_reuse;
-int sysctl_tcp_low_latency;
+#include <linux/crypto.h>
+#include <linux/scatterlist.h>
+
+int sysctl_tcp_tw_reuse __read_mostly;
+int sysctl_tcp_low_latency __read_mostly;
/* Check TCP sequence numbers in ICMP packets. */
#define ICMP_MIN_LENGTH 8
/* Socket used for sending RSTs */
-static struct socket *tcp_socket;
+static struct socket *tcp_socket __read_mostly;
void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);
+#ifdef CONFIG_TCP_MD5SIG
+static struct tcp_md5sig_key *tcp_v4_md5_do_lookup(struct sock *sk,
+ __be32 addr);
+static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
+ __be32 saddr, __be32 daddr,
+ struct tcphdr *th, int protocol,
+ int tcplen);
+#endif
+
struct inet_hashinfo __cacheline_aligned tcp_hashinfo = {
- .lhash_lock = RW_LOCK_UNLOCKED,
- .lhash_users = ATOMIC_INIT(0),
- .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(tcp_hashinfo.lhash_wait),
+ .lhash_lock = __RW_LOCK_UNLOCKED(tcp_hashinfo.lhash_lock),
+ .lhash_users = ATOMIC_INIT(0),
+ .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(tcp_hashinfo.lhash_wait),
};
static int tcp_v4_get_port(struct sock *sk, unsigned short snum)
inet_unhash(&tcp_hashinfo, sk);
}
-static inline __u32 tcp_v4_init_sequence(struct sock *sk, struct sk_buff *skb)
+static inline __u32 tcp_v4_init_sequence(struct sk_buff *skb)
{
- return secure_tcp_sequence_number(skb->nh.iph->daddr,
- skb->nh.iph->saddr,
- skb->h.th->dest,
- skb->h.th->source);
+ return secure_tcp_sequence_number(ip_hdr(skb)->daddr,
+ ip_hdr(skb)->saddr,
+ tcp_hdr(skb)->dest,
+ tcp_hdr(skb)->source);
}
-/* called with local bh disabled */
-static int __tcp_v4_check_established(struct sock *sk, __u16 lport,
- struct inet_timewait_sock **twp)
+int tcp_twsk_unique(struct sock *sk, struct sock *sktw, void *twp)
{
- struct inet_sock *inet = inet_sk(sk);
- u32 daddr = inet->rcv_saddr;
- u32 saddr = inet->daddr;
- int dif = sk->sk_bound_dev_if;
- INET_ADDR_COOKIE(acookie, saddr, daddr)
- const __u32 ports = INET_COMBINED_PORTS(inet->dport, lport);
- unsigned int hash = inet_ehashfn(daddr, lport, saddr, inet->dport);
- struct inet_ehash_bucket *head = inet_ehash_bucket(&tcp_hashinfo, hash);
- struct sock *sk2;
- const struct hlist_node *node;
- struct inet_timewait_sock *tw;
-
- prefetch(head->chain.first);
- write_lock(&head->lock);
-
- /* Check TIME-WAIT sockets first. */
- sk_for_each(sk2, node, &(head + tcp_hashinfo.ehash_size)->chain) {
- tw = inet_twsk(sk2);
-
- if (INET_TW_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif)) {
- const struct tcp_timewait_sock *tcptw = tcp_twsk(sk2);
- struct tcp_sock *tp = tcp_sk(sk);
-
- /* With PAWS, it is safe from the viewpoint
- of data integrity. Even without PAWS it
- is safe provided sequence spaces do not
- overlap i.e. at data rates <= 80Mbit/sec.
-
- Actually, the idea is close to VJ's one,
- only timestamp cache is held not per host,
- but per port pair and TW bucket is used
- as state holder.
-
- If TW bucket has been already destroyed we
- fall back to VJ's scheme and use initial
- timestamp retrieved from peer table.
- */
- if (tcptw->tw_ts_recent_stamp &&
- (!twp || (sysctl_tcp_tw_reuse &&
- xtime.tv_sec -
- tcptw->tw_ts_recent_stamp > 1))) {
- tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2;
- if (tp->write_seq == 0)
- tp->write_seq = 1;
- tp->rx_opt.ts_recent = tcptw->tw_ts_recent;
- tp->rx_opt.ts_recent_stamp = tcptw->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 (INET_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif))
- goto not_unique;
- }
+ const struct tcp_timewait_sock *tcptw = tcp_twsk(sktw);
+ struct tcp_sock *tp = tcp_sk(sk);
-unique:
- /* Must record num and sport now. Otherwise we will see
- * in hash table socket with a funny identity. */
- inet->num = lport;
- inet->sport = htons(lport);
- sk->sk_hash = hash;
- BUG_TRAP(sk_unhashed(sk));
- __sk_add_node(sk, &head->chain);
- sock_prot_inc_use(sk->sk_prot);
- write_unlock(&head->lock);
+ /* With PAWS, it is safe from the viewpoint
+ of data integrity. Even without PAWS it is safe provided sequence
+ spaces do not overlap i.e. at data rates <= 80Mbit/sec.
- if (twp) {
- *twp = tw;
- NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
- } else if (tw) {
- /* Silly. Should hash-dance instead... */
- inet_twsk_deschedule(tw, &tcp_death_row);
- NET_INC_STATS_BH(LINUX_MIB_TIMEWAITRECYCLED);
+ Actually, the idea is close to VJ's one, only timestamp cache is
+ held not per host, but per port pair and TW bucket is used as state
+ holder.
- inet_twsk_put(tw);
+ If TW bucket has been already destroyed we fall back to VJ's scheme
+ and use initial timestamp retrieved from peer table.
+ */
+ if (tcptw->tw_ts_recent_stamp &&
+ (twp == NULL || (sysctl_tcp_tw_reuse &&
+ get_seconds() - tcptw->tw_ts_recent_stamp > 1))) {
+ tp->write_seq = tcptw->tw_snd_nxt + 65535 + 2;
+ if (tp->write_seq == 0)
+ tp->write_seq = 1;
+ tp->rx_opt.ts_recent = tcptw->tw_ts_recent;
+ tp->rx_opt.ts_recent_stamp = tcptw->tw_ts_recent_stamp;
+ sock_hold(sktw);
+ return 1;
}
return 0;
-
-not_unique:
- write_unlock(&head->lock);
- return -EADDRNOTAVAIL;
-}
-
-static inline u32 connect_port_offset(const struct sock *sk)
-{
- const struct inet_sock *inet = inet_sk(sk);
-
- return secure_tcp_port_ephemeral(inet->rcv_saddr, inet->daddr,
- inet->dport);
}
-/*
- * Bind a port for a connect operation and hash it.
- */
-static inline int tcp_v4_hash_connect(struct sock *sk)
-{
- const unsigned short snum = inet_sk(sk)->num;
- struct inet_bind_hashbucket *head;
- struct inet_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 + connect_port_offset(sk);
- struct hlist_node *node;
- struct inet_timewait_sock *tw = NULL;
-
- local_bh_disable();
- for (i = 1; i <= range; i++) {
- port = low + (i + offset) % range;
- head = &tcp_hashinfo.bhash[inet_bhashfn(port, tcp_hashinfo.bhash_size)];
- spin_lock(&head->lock);
-
- /* Does not bother with rcv_saddr checks,
- * because the established check is already
- * unique enough.
- */
- inet_bind_bucket_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_v4_check_established(sk,
- port,
- &tw))
- goto ok;
- goto next_port;
- }
- }
-
- tb = inet_bind_bucket_create(tcp_hashinfo.bind_bucket_cachep, 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 */
- inet_bind_hash(sk, tb, port);
- if (sk_unhashed(sk)) {
- inet_sk(sk)->sport = htons(port);
- __inet_hash(&tcp_hashinfo, sk, 0);
- }
- spin_unlock(&head->lock);
-
- if (tw) {
- inet_twsk_deschedule(tw, &tcp_death_row);;
- inet_twsk_put(tw);
- }
-
- ret = 0;
- goto out;
- }
-
- head = &tcp_hashinfo.bhash[inet_bhashfn(snum, tcp_hashinfo.bhash_size)];
- tb = inet_csk(sk)->icsk_bind_hash;
- spin_lock_bh(&head->lock);
- if (sk_head(&tb->owners) == sk && !sk->sk_bind_node.next) {
- __inet_hash(&tcp_hashinfo, sk, 0);
- spin_unlock_bh(&head->lock);
- return 0;
- } else {
- spin_unlock(&head->lock);
- /* No definite answer... Walk to established hash table */
- ret = __tcp_v4_check_established(sk, snum, NULL);
-out:
- local_bh_enable();
- return ret;
- }
-}
+EXPORT_SYMBOL_GPL(tcp_twsk_unique);
/* This will initiate an outgoing connection. */
int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
struct tcp_sock *tp = tcp_sk(sk);
struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
struct rtable *rt;
- u32 daddr, nexthop;
+ __be32 daddr, nexthop;
int tmp;
int err;
tmp = ip_route_connect(&rt, nexthop, inet->saddr,
RT_CONN_FLAGS(sk), sk->sk_bound_dev_if,
IPPROTO_TCP,
- inet->sport, usin->sin_port, sk);
- if (tmp < 0)
+ inet->sport, usin->sin_port, sk, 1);
+ if (tmp < 0) {
+ if (tmp == -ENETUNREACH)
+ IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
return tmp;
+ }
if (rt->rt_flags & (RTCF_MULTICAST | RTCF_BROADCAST)) {
ip_rt_put(rt);
if (tcp_death_row.sysctl_tw_recycle &&
!tp->rx_opt.ts_recent_stamp && rt->rt_dst == daddr) {
struct inet_peer *peer = rt_get_peer(rt);
-
- /* VJ's idea. We save last timestamp seen from
- * the destination in peer table, when entering state TIME-WAIT
- * and initialize rx_opt.ts_recent from it, when trying new connection.
+ /*
+ * VJ's idea. We save last timestamp seen from
+ * the destination in peer table, when entering state
+ * TIME-WAIT * and initialize rx_opt.ts_recent from it,
+ * when trying new connection.
*/
-
- if (peer && peer->tcp_ts_stamp + TCP_PAWS_MSL >= xtime.tv_sec) {
+ if (peer != NULL &&
+ peer->tcp_ts_stamp + TCP_PAWS_MSL >= get_seconds()) {
tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
tp->rx_opt.ts_recent = peer->tcp_ts;
}
inet->dport = usin->sin_port;
inet->daddr = daddr;
- tp->ext_header_len = 0;
+ inet_csk(sk)->icsk_ext_hdr_len = 0;
if (inet->opt)
- tp->ext_header_len = inet->opt->optlen;
+ inet_csk(sk)->icsk_ext_hdr_len = inet->opt->optlen;
tp->rx_opt.mss_clamp = 536;
* complete initialization after this.
*/
tcp_set_state(sk, TCP_SYN_SENT);
- err = tcp_v4_hash_connect(sk);
+ err = inet_hash_connect(&tcp_death_row, sk);
if (err)
goto failure;
- err = ip_route_newports(&rt, inet->sport, inet->dport, sk);
+ err = ip_route_newports(&rt, IPPROTO_TCP,
+ inet->sport, inet->dport, sk);
if (err)
goto failure;
/* OK, now commit destination to socket. */
+ sk->sk_gso_type = SKB_GSO_TCPV4;
sk_setup_caps(sk, &rt->u.dst);
if (!tp->write_seq)
return 0;
failure:
- /* This unhashes the socket and releases the local port, if necessary. */
+ /*
+ * This unhashes the socket and releases the local port,
+ * if necessary.
+ */
tcp_set_state(sk, TCP_CLOSE);
ip_rt_put(rt);
sk->sk_route_caps = 0;
/*
* This routine does path mtu discovery as defined in RFC1191.
*/
-static inline void do_pmtu_discovery(struct sock *sk, struct iphdr *iph,
- u32 mtu)
+static void do_pmtu_discovery(struct sock *sk, struct iphdr *iph, u32 mtu)
{
struct dst_entry *dst;
struct inet_sock *inet = inet_sk(sk);
- struct tcp_sock *tp = tcp_sk(sk);
/* We are not interested in TCP_LISTEN and open_requests (SYN-ACKs
* send out by Linux are always <576bytes so they should go through
/* We don't check in the destentry if pmtu discovery is forbidden
* on this route. We just assume that no packet_to_big packets
* are send back when pmtu discovery is not active.
- * There is a small race when the user changes this flag in the
+ * There is a small race when the user changes this flag in the
* route, but I think that's acceptable.
*/
if ((dst = __sk_dst_check(sk, 0)) == NULL)
mtu = dst_mtu(dst);
if (inet->pmtudisc != IP_PMTUDISC_DONT &&
- tp->pmtu_cookie > mtu) {
+ inet_csk(sk)->icsk_pmtu_cookie > mtu) {
tcp_sync_mss(sk, mtu);
/* Resend the TCP packet because it's
struct tcphdr *th = (struct tcphdr *)(skb->data + (iph->ihl << 2));
struct tcp_sock *tp;
struct inet_sock *inet;
- int type = skb->h.icmph->type;
- int code = skb->h.icmph->code;
+ const int type = icmp_hdr(skb)->type;
+ const int code = icmp_hdr(skb)->code;
struct sock *sk;
__u32 seq;
int err;
return;
}
if (sk->sk_state == TCP_TIME_WAIT) {
- inet_twsk_put((struct inet_timewait_sock *)sk);
+ inet_twsk_put(inet_twsk(sk));
return;
}
seq = ntohl(th->seq);
if (sk->sk_state != TCP_LISTEN &&
!between(seq, tp->snd_una, tp->snd_nxt)) {
- NET_INC_STATS(LINUX_MIB_OUTOFWINDOWICMPS);
+ NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
goto out;
}
It can f.e. if SYNs crossed.
*/
if (!sock_owned_by_user(sk)) {
- TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS);
sk->sk_err = err;
sk->sk_error_report(sk);
void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
{
struct inet_sock *inet = inet_sk(sk);
- struct tcphdr *th = skb->h.th;
+ struct tcphdr *th = tcp_hdr(skb);
- if (skb->ip_summed == CHECKSUM_HW) {
- th->check = ~tcp_v4_check(th, len, inet->saddr, inet->daddr, 0);
- skb->csum = offsetof(struct tcphdr, check);
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ th->check = ~tcp_v4_check(len, inet->saddr,
+ inet->daddr, 0);
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct tcphdr, check);
} else {
- th->check = tcp_v4_check(th, len, inet->saddr, inet->daddr,
+ th->check = tcp_v4_check(len, inet->saddr, inet->daddr,
csum_partial((char *)th,
th->doff << 2,
skb->csum));
}
}
+int tcp_v4_gso_send_check(struct sk_buff *skb)
+{
+ const struct iphdr *iph;
+ struct tcphdr *th;
+
+ if (!pskb_may_pull(skb, sizeof(*th)))
+ return -EINVAL;
+
+ iph = ip_hdr(skb);
+ th = tcp_hdr(skb);
+
+ th->check = 0;
+ th->check = ~tcp_v4_check(skb->len, iph->saddr, iph->daddr, 0);
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct tcphdr, check);
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ return 0;
+}
+
/*
* This routine will send an RST to the other tcp.
*
* Exception: precedence violation. We do not implement it in any case.
*/
-static void tcp_v4_send_reset(struct sk_buff *skb)
+static void tcp_v4_send_reset(struct sock *sk, struct sk_buff *skb)
{
- struct tcphdr *th = skb->h.th;
- struct tcphdr rth;
+ struct tcphdr *th = tcp_hdr(skb);
+ struct {
+ struct tcphdr th;
+#ifdef CONFIG_TCP_MD5SIG
+ __be32 opt[(TCPOLEN_MD5SIG_ALIGNED >> 2)];
+#endif
+ } rep;
struct ip_reply_arg arg;
+#ifdef CONFIG_TCP_MD5SIG
+ struct tcp_md5sig_key *key;
+#endif
/* Never send a reset in response to a reset. */
if (th->rst)
return;
/* Swap the send and the receive. */
- memset(&rth, 0, sizeof(struct tcphdr));
- rth.dest = th->source;
- rth.source = th->dest;
- rth.doff = sizeof(struct tcphdr) / 4;
- rth.rst = 1;
+ memset(&rep, 0, sizeof(rep));
+ rep.th.dest = th->source;
+ rep.th.source = th->dest;
+ rep.th.doff = sizeof(struct tcphdr) / 4;
+ rep.th.rst = 1;
if (th->ack) {
- rth.seq = th->ack_seq;
+ rep.th.seq = th->ack_seq;
} else {
- rth.ack = 1;
- rth.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin +
- skb->len - (th->doff << 2));
+ rep.th.ack = 1;
+ rep.th.ack_seq = htonl(ntohl(th->seq) + th->syn + th->fin +
+ skb->len - (th->doff << 2));
}
- memset(&arg, 0, sizeof arg);
- arg.iov[0].iov_base = (unsigned char *)&rth;
- arg.iov[0].iov_len = sizeof rth;
- arg.csum = csum_tcpudp_nofold(skb->nh.iph->daddr,
- skb->nh.iph->saddr, /*XXX*/
+ memset(&arg, 0, sizeof(arg));
+ arg.iov[0].iov_base = (unsigned char *)&rep;
+ arg.iov[0].iov_len = sizeof(rep.th);
+
+#ifdef CONFIG_TCP_MD5SIG
+ key = sk ? tcp_v4_md5_do_lookup(sk, ip_hdr(skb)->daddr) : NULL;
+ if (key) {
+ rep.opt[0] = htonl((TCPOPT_NOP << 24) |
+ (TCPOPT_NOP << 16) |
+ (TCPOPT_MD5SIG << 8) |
+ TCPOLEN_MD5SIG);
+ /* Update length and the length the header thinks exists */
+ arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED;
+ rep.th.doff = arg.iov[0].iov_len / 4;
+
+ tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[1],
+ key,
+ ip_hdr(skb)->daddr,
+ ip_hdr(skb)->saddr,
+ &rep.th, IPPROTO_TCP,
+ arg.iov[0].iov_len);
+ }
+#endif
+ arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
+ ip_hdr(skb)->saddr, /* XXX */
sizeof(struct tcphdr), IPPROTO_TCP, 0);
arg.csumoffset = offsetof(struct tcphdr, check) / 2;
- ip_send_reply(tcp_socket->sk, skb, &arg, sizeof rth);
+ ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len);
TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
outside socket context is ugly, certainly. What can I do?
*/
-static void tcp_v4_send_ack(struct sk_buff *skb, u32 seq, u32 ack,
+static void tcp_v4_send_ack(struct tcp_timewait_sock *twsk,
+ struct sk_buff *skb, u32 seq, u32 ack,
u32 win, u32 ts)
{
- struct tcphdr *th = skb->h.th;
+ struct tcphdr *th = tcp_hdr(skb);
struct {
struct tcphdr th;
- u32 tsopt[3];
+ __be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2)
+#ifdef CONFIG_TCP_MD5SIG
+ + (TCPOLEN_MD5SIG_ALIGNED >> 2)
+#endif
+ ];
} rep;
struct ip_reply_arg arg;
+#ifdef CONFIG_TCP_MD5SIG
+ struct tcp_md5sig_key *key;
+ struct tcp_md5sig_key tw_key;
+#endif
memset(&rep.th, 0, sizeof(struct tcphdr));
- memset(&arg, 0, sizeof arg);
+ memset(&arg, 0, sizeof(arg));
arg.iov[0].iov_base = (unsigned char *)&rep;
arg.iov[0].iov_len = sizeof(rep.th);
if (ts) {
- rep.tsopt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
- (TCPOPT_TIMESTAMP << 8) |
- TCPOLEN_TIMESTAMP);
- rep.tsopt[1] = htonl(tcp_time_stamp);
- rep.tsopt[2] = htonl(ts);
- arg.iov[0].iov_len = sizeof(rep);
+ rep.opt[0] = htonl((TCPOPT_NOP << 24) | (TCPOPT_NOP << 16) |
+ (TCPOPT_TIMESTAMP << 8) |
+ TCPOLEN_TIMESTAMP);
+ rep.opt[1] = htonl(tcp_time_stamp);
+ rep.opt[2] = htonl(ts);
+ arg.iov[0].iov_len += TCPOLEN_TSTAMP_ALIGNED;
}
/* Swap the send and the receive. */
rep.th.ack = 1;
rep.th.window = htons(win);
- arg.csum = csum_tcpudp_nofold(skb->nh.iph->daddr,
- skb->nh.iph->saddr, /*XXX*/
+#ifdef CONFIG_TCP_MD5SIG
+ /*
+ * The SKB holds an imcoming packet, but may not have a valid ->sk
+ * pointer. This is especially the case when we're dealing with a
+ * TIME_WAIT ack, because the sk structure is long gone, and only
+ * the tcp_timewait_sock remains. So the md5 key is stashed in that
+ * structure, and we use it in preference. I believe that (twsk ||
+ * skb->sk) holds true, but we program defensively.
+ */
+ if (!twsk && skb->sk) {
+ key = tcp_v4_md5_do_lookup(skb->sk, ip_hdr(skb)->daddr);
+ } else if (twsk && twsk->tw_md5_keylen) {
+ tw_key.key = twsk->tw_md5_key;
+ tw_key.keylen = twsk->tw_md5_keylen;
+ key = &tw_key;
+ } else
+ key = NULL;
+
+ if (key) {
+ int offset = (ts) ? 3 : 0;
+
+ rep.opt[offset++] = htonl((TCPOPT_NOP << 24) |
+ (TCPOPT_NOP << 16) |
+ (TCPOPT_MD5SIG << 8) |
+ TCPOLEN_MD5SIG);
+ arg.iov[0].iov_len += TCPOLEN_MD5SIG_ALIGNED;
+ rep.th.doff = arg.iov[0].iov_len/4;
+
+ tcp_v4_do_calc_md5_hash((__u8 *)&rep.opt[offset],
+ key,
+ ip_hdr(skb)->daddr,
+ ip_hdr(skb)->saddr,
+ &rep.th, IPPROTO_TCP,
+ arg.iov[0].iov_len);
+ }
+#endif
+ arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
+ ip_hdr(skb)->saddr, /* XXX */
arg.iov[0].iov_len, IPPROTO_TCP, 0);
arg.csumoffset = offsetof(struct tcphdr, check) / 2;
+ if (twsk)
+ arg.bound_dev_if = twsk->tw_sk.tw_bound_dev_if;
ip_send_reply(tcp_socket->sk, skb, &arg, arg.iov[0].iov_len);
static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
{
struct inet_timewait_sock *tw = inet_twsk(sk);
- const struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
+ struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
- tcp_v4_send_ack(skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
- tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale, tcptw->tw_ts_recent);
+ tcp_v4_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_v4_reqsk_send_ack(struct sk_buff *skb, struct request_sock *req)
+static void tcp_v4_reqsk_send_ack(struct sk_buff *skb,
+ struct request_sock *req)
{
- tcp_v4_send_ack(skb, tcp_rsk(req)->snt_isn + 1, tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd,
+ tcp_v4_send_ack(NULL, skb, tcp_rsk(req)->snt_isn + 1,
+ tcp_rsk(req)->rcv_isn + 1, req->rcv_wnd,
req->ts_recent);
}
skb = tcp_make_synack(sk, dst, req);
if (skb) {
- struct tcphdr *th = skb->h.th;
+ struct tcphdr *th = tcp_hdr(skb);
- th->check = tcp_v4_check(th, skb->len,
+ th->check = tcp_v4_check(skb->len,
ireq->loc_addr,
ireq->rmt_addr,
csum_partial((char *)th, skb->len,
err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr,
ireq->rmt_addr,
ireq->opt);
- if (err == NET_XMIT_CN)
- err = 0;
+ err = net_xmit_eval(err);
}
out:
kfree(inet_rsk(req)->opt);
}
-static inline void syn_flood_warning(struct sk_buff *skb)
+#ifdef CONFIG_SYN_COOKIES
+static void syn_flood_warning(struct sk_buff *skb)
{
static unsigned long warntime;
warntime = jiffies;
printk(KERN_INFO
"possible SYN flooding on port %d. Sending cookies.\n",
- ntohs(skb->h.th->dest));
+ ntohs(tcp_hdr(skb)->dest));
}
}
+#endif
/*
* Save and compile IPv4 options into the request_sock if needed.
*/
-static inline struct ip_options *tcp_v4_save_options(struct sock *sk,
- struct sk_buff *skb)
+static struct ip_options *tcp_v4_save_options(struct sock *sk,
+ struct sk_buff *skb)
{
struct ip_options *opt = &(IPCB(skb)->opt);
struct ip_options *dopt = NULL;
return dopt;
}
-struct request_sock_ops tcp_request_sock_ops = {
+#ifdef CONFIG_TCP_MD5SIG
+/*
+ * RFC2385 MD5 checksumming requires a mapping of
+ * IP address->MD5 Key.
+ * We need to maintain these in the sk structure.
+ */
+
+/* Find the Key structure for an address. */
+static struct tcp_md5sig_key *
+ tcp_v4_md5_do_lookup(struct sock *sk, __be32 addr)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ int i;
+
+ if (!tp->md5sig_info || !tp->md5sig_info->entries4)
+ return NULL;
+ for (i = 0; i < tp->md5sig_info->entries4; i++) {
+ if (tp->md5sig_info->keys4[i].addr == addr)
+ return (struct tcp_md5sig_key *)
+ &tp->md5sig_info->keys4[i];
+ }
+ return NULL;
+}
+
+struct tcp_md5sig_key *tcp_v4_md5_lookup(struct sock *sk,
+ struct sock *addr_sk)
+{
+ return tcp_v4_md5_do_lookup(sk, inet_sk(addr_sk)->daddr);
+}
+
+EXPORT_SYMBOL(tcp_v4_md5_lookup);
+
+static struct tcp_md5sig_key *tcp_v4_reqsk_md5_lookup(struct sock *sk,
+ struct request_sock *req)
+{
+ return tcp_v4_md5_do_lookup(sk, inet_rsk(req)->rmt_addr);
+}
+
+/* This can be called on a newly created socket, from other files */
+int tcp_v4_md5_do_add(struct sock *sk, __be32 addr,
+ u8 *newkey, u8 newkeylen)
+{
+ /* Add Key to the list */
+ struct tcp4_md5sig_key *key;
+ struct tcp_sock *tp = tcp_sk(sk);
+ struct tcp4_md5sig_key *keys;
+
+ key = (struct tcp4_md5sig_key *)tcp_v4_md5_do_lookup(sk, addr);
+ if (key) {
+ /* Pre-existing entry - just update that one. */
+ kfree(key->key);
+ key->key = newkey;
+ key->keylen = newkeylen;
+ } else {
+ struct tcp_md5sig_info *md5sig;
+
+ if (!tp->md5sig_info) {
+ tp->md5sig_info = kzalloc(sizeof(*tp->md5sig_info),
+ GFP_ATOMIC);
+ if (!tp->md5sig_info) {
+ kfree(newkey);
+ return -ENOMEM;
+ }
+ }
+ if (tcp_alloc_md5sig_pool() == NULL) {
+ kfree(newkey);
+ return -ENOMEM;
+ }
+ md5sig = tp->md5sig_info;
+
+ if (md5sig->alloced4 == md5sig->entries4) {
+ keys = kmalloc((sizeof(*keys) *
+ (md5sig->entries4 + 1)), GFP_ATOMIC);
+ if (!keys) {
+ kfree(newkey);
+ tcp_free_md5sig_pool();
+ return -ENOMEM;
+ }
+
+ if (md5sig->entries4)
+ memcpy(keys, md5sig->keys4,
+ sizeof(*keys) * md5sig->entries4);
+
+ /* Free old key list, and reference new one */
+ if (md5sig->keys4)
+ kfree(md5sig->keys4);
+ md5sig->keys4 = keys;
+ md5sig->alloced4++;
+ }
+ md5sig->entries4++;
+ md5sig->keys4[md5sig->entries4 - 1].addr = addr;
+ md5sig->keys4[md5sig->entries4 - 1].key = newkey;
+ md5sig->keys4[md5sig->entries4 - 1].keylen = newkeylen;
+ }
+ return 0;
+}
+
+EXPORT_SYMBOL(tcp_v4_md5_do_add);
+
+static int tcp_v4_md5_add_func(struct sock *sk, struct sock *addr_sk,
+ u8 *newkey, u8 newkeylen)
+{
+ return tcp_v4_md5_do_add(sk, inet_sk(addr_sk)->daddr,
+ newkey, newkeylen);
+}
+
+int tcp_v4_md5_do_del(struct sock *sk, __be32 addr)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+ int i;
+
+ for (i = 0; i < tp->md5sig_info->entries4; i++) {
+ if (tp->md5sig_info->keys4[i].addr == addr) {
+ /* Free the key */
+ kfree(tp->md5sig_info->keys4[i].key);
+ tp->md5sig_info->entries4--;
+
+ if (tp->md5sig_info->entries4 == 0) {
+ kfree(tp->md5sig_info->keys4);
+ tp->md5sig_info->keys4 = NULL;
+ tp->md5sig_info->alloced4 = 0;
+ } else if (tp->md5sig_info->entries4 != i) {
+ /* Need to do some manipulation */
+ memcpy(&tp->md5sig_info->keys4[i],
+ &tp->md5sig_info->keys4[i+1],
+ (tp->md5sig_info->entries4 - i) *
+ sizeof(struct tcp4_md5sig_key));
+ }
+ tcp_free_md5sig_pool();
+ return 0;
+ }
+ }
+ return -ENOENT;
+}
+
+EXPORT_SYMBOL(tcp_v4_md5_do_del);
+
+static void tcp_v4_clear_md5_list(struct sock *sk)
+{
+ struct tcp_sock *tp = tcp_sk(sk);
+
+ /* Free each key, then the set of key keys,
+ * the crypto element, and then decrement our
+ * hold on the last resort crypto.
+ */
+ if (tp->md5sig_info->entries4) {
+ int i;
+ for (i = 0; i < tp->md5sig_info->entries4; i++)
+ kfree(tp->md5sig_info->keys4[i].key);
+ tp->md5sig_info->entries4 = 0;
+ tcp_free_md5sig_pool();
+ }
+ if (tp->md5sig_info->keys4) {
+ kfree(tp->md5sig_info->keys4);
+ tp->md5sig_info->keys4 = NULL;
+ tp->md5sig_info->alloced4 = 0;
+ }
+}
+
+static int tcp_v4_parse_md5_keys(struct sock *sk, char __user *optval,
+ int optlen)
+{
+ struct tcp_md5sig cmd;
+ struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr;
+ u8 *newkey;
+
+ if (optlen < sizeof(cmd))
+ return -EINVAL;
+
+ if (copy_from_user(&cmd, optval, sizeof(cmd)))
+ return -EFAULT;
+
+ if (sin->sin_family != AF_INET)
+ return -EINVAL;
+
+ if (!cmd.tcpm_key || !cmd.tcpm_keylen) {
+ if (!tcp_sk(sk)->md5sig_info)
+ return -ENOENT;
+ return tcp_v4_md5_do_del(sk, sin->sin_addr.s_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 = kzalloc(sizeof(*p), GFP_KERNEL);
+
+ if (!p)
+ return -EINVAL;
+
+ tp->md5sig_info = p;
+
+ }
+
+ newkey = kmemdup(cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
+ if (!newkey)
+ return -ENOMEM;
+ return tcp_v4_md5_do_add(sk, sin->sin_addr.s_addr,
+ newkey, cmd.tcpm_keylen);
+}
+
+static int tcp_v4_do_calc_md5_hash(char *md5_hash, struct tcp_md5sig_key *key,
+ __be32 saddr, __be32 daddr,
+ struct tcphdr *th, int protocol,
+ int tcplen)
+{
+ struct scatterlist sg[4];
+ __u16 data_len;
+ int block = 0;
+ __sum16 old_checksum;
+ struct tcp_md5sig_pool *hp;
+ struct tcp4_pseudohdr *bp;
+ struct hash_desc *desc;
+ int err;
+ unsigned int nbytes = 0;
+
+ /*
+ * Okay, so RFC2385 is turned on for this connection,
+ * so we need to generate the MD5 hash for the packet now.
+ */
+
+ hp = tcp_get_md5sig_pool();
+ if (!hp)
+ goto clear_hash_noput;
+
+ bp = &hp->md5_blk.ip4;
+ desc = &hp->md5_desc;
+
+ /*
+ * 1. the TCP pseudo-header (in the order: source IP address,
+ * destination IP address, zero-padded protocol number, and
+ * segment length)
+ */
+ bp->saddr = saddr;
+ bp->daddr = daddr;
+ bp->pad = 0;
+ bp->protocol = protocol;
+ bp->len = htons(tcplen);
+ sg_set_buf(&sg[block++], bp, sizeof(*bp));
+ nbytes += sizeof(*bp);
+
+ /* 2. the TCP header, excluding options, and assuming a
+ * checksum of zero/
+ */
+ old_checksum = th->check;
+ th->check = 0;
+ sg_set_buf(&sg[block++], th, sizeof(struct tcphdr));
+ nbytes += sizeof(struct tcphdr);
+
+ /* 3. the TCP segment data (if any) */
+ data_len = tcplen - (th->doff << 2);
+ if (data_len > 0) {
+ unsigned char *data = (unsigned char *)th + (th->doff << 2);
+ sg_set_buf(&sg[block++], data, data_len);
+ nbytes += data_len;
+ }
+
+ /* 4. an independently-specified key or password, known to both
+ * TCPs and presumably connection-specific
+ */
+ sg_set_buf(&sg[block++], key->key, key->keylen);
+ nbytes += key->keylen;
+
+ /* Now store the Hash into the packet */
+ err = crypto_hash_init(desc);
+ if (err)
+ goto clear_hash;
+ err = crypto_hash_update(desc, sg, nbytes);
+ if (err)
+ goto clear_hash;
+ err = crypto_hash_final(desc, md5_hash);
+ if (err)
+ goto clear_hash;
+
+ /* Reset header, and free up the crypto */
+ tcp_put_md5sig_pool();
+ th->check = old_checksum;
+
+out:
+ return 0;
+clear_hash:
+ tcp_put_md5sig_pool();
+clear_hash_noput:
+ memset(md5_hash, 0, 16);
+ goto out;
+}
+
+int tcp_v4_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,
+ int tcplen)
+{
+ __be32 saddr, daddr;
+
+ if (sk) {
+ saddr = inet_sk(sk)->saddr;
+ daddr = inet_sk(sk)->daddr;
+ } else {
+ struct rtable *rt = (struct rtable *)dst;
+ BUG_ON(!rt);
+ saddr = rt->rt_src;
+ daddr = rt->rt_dst;
+ }
+ return tcp_v4_do_calc_md5_hash(md5_hash, key,
+ saddr, daddr,
+ th, protocol, tcplen);
+}
+
+EXPORT_SYMBOL(tcp_v4_calc_md5_hash);
+
+static int tcp_v4_inbound_md5_hash(struct sock *sk, struct sk_buff *skb)
+{
+ /*
+ * This gets called for each TCP segment that arrives
+ * so we want to be efficient.
+ * We have 3 drop cases:
+ * o No MD5 hash and one expected.
+ * o MD5 hash and we're not expecting one.
+ * o MD5 hash and its wrong.
+ */
+ __u8 *hash_location = NULL;
+ struct tcp_md5sig_key *hash_expected;
+ const struct iphdr *iph = ip_hdr(skb);
+ struct tcphdr *th = tcp_hdr(skb);
+ int length = (th->doff << 2) - sizeof(struct tcphdr);
+ int genhash;
+ unsigned char *ptr;
+ unsigned char newhash[16];
+
+ hash_expected = tcp_v4_md5_do_lookup(sk, iph->saddr);
+
+ /*
+ * If the TCP option length is less than the TCP_MD5SIG
+ * option length, then we can shortcut
+ */
+ if (length < TCPOLEN_MD5SIG) {
+ if (hash_expected)
+ return 1;
+ else
+ return 0;
+ }
+
+ /* Okay, we can't shortcut - we have to grub through the options */
+ ptr = (unsigned char *)(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)
+ goto done_opts;
+ if (opsize > length)
+ goto done_opts;
+
+ if (opcode == TCPOPT_MD5SIG) {
+ hash_location = ptr;
+ goto done_opts;
+ }
+ }
+ ptr += opsize-2;
+ length -= opsize;
+ }
+done_opts:
+ /* We've parsed the options - do we have a hash? */
+ if (!hash_expected && !hash_location)
+ return 0;
+
+ if (hash_expected && !hash_location) {
+ LIMIT_NETDEBUG(KERN_INFO "MD5 Hash expected but NOT found "
+ "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n",
+ NIPQUAD(iph->saddr), ntohs(th->source),
+ NIPQUAD(iph->daddr), ntohs(th->dest));
+ return 1;
+ }
+
+ if (!hash_expected && hash_location) {
+ LIMIT_NETDEBUG(KERN_INFO "MD5 Hash NOT expected but found "
+ "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)\n",
+ NIPQUAD(iph->saddr), ntohs(th->source),
+ NIPQUAD(iph->daddr), ntohs(th->dest));
+ return 1;
+ }
+
+ /* Okay, so this is hash_expected and hash_location -
+ * so we need to calculate the checksum.
+ */
+ genhash = tcp_v4_do_calc_md5_hash(newhash,
+ hash_expected,
+ iph->saddr, iph->daddr,
+ th, sk->sk_protocol,
+ skb->len);
+
+ if (genhash || memcmp(hash_location, newhash, 16) != 0) {
+ if (net_ratelimit()) {
+ printk(KERN_INFO "MD5 Hash failed for "
+ "(" NIPQUAD_FMT ", %d)->(" NIPQUAD_FMT ", %d)%s\n",
+ NIPQUAD(iph->saddr), ntohs(th->source),
+ NIPQUAD(iph->daddr), ntohs(th->dest),
+ genhash ? " tcp_v4_calc_md5_hash failed" : "");
+ }
+ return 1;
+ }
+ return 0;
+}
+
+#endif
+
+struct request_sock_ops tcp_request_sock_ops __read_mostly = {
.family = PF_INET,
.obj_size = sizeof(struct tcp_request_sock),
.rtx_syn_ack = tcp_v4_send_synack,
.send_reset = tcp_v4_send_reset,
};
+#ifdef CONFIG_TCP_MD5SIG
+static struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
+ .md5_lookup = tcp_v4_reqsk_md5_lookup,
+};
+#endif
+
+static struct timewait_sock_ops tcp_timewait_sock_ops = {
+ .twsk_obj_size = sizeof(struct tcp_timewait_sock),
+ .twsk_unique = tcp_twsk_unique,
+ .twsk_destructor= tcp_twsk_destructor,
+};
+
int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
{
struct inet_request_sock *ireq;
struct tcp_options_received tmp_opt;
struct request_sock *req;
- __u32 saddr = skb->nh.iph->saddr;
- __u32 daddr = skb->nh.iph->daddr;
+ __be32 saddr = ip_hdr(skb)->saddr;
+ __be32 daddr = ip_hdr(skb)->daddr;
__u32 isn = TCP_SKB_CB(skb)->when;
struct dst_entry *dst = NULL;
#ifdef CONFIG_SYN_COOKIES
if (!req)
goto drop;
+#ifdef CONFIG_TCP_MD5SIG
+ tcp_rsk(req)->af_specific = &tcp_request_sock_ipv4_ops;
+#endif
+
tcp_clear_options(&tmp_opt);
tmp_opt.mss_clamp = 536;
tmp_opt.user_mss = tcp_sk(sk)->rx_opt.user_mss;
tcp_openreq_init(req, &tmp_opt, skb);
+ if (security_inet_conn_request(sk, skb, req))
+ goto drop_and_free;
+
ireq = inet_rsk(req);
ireq->loc_addr = daddr;
ireq->rmt_addr = saddr;
ireq->opt = tcp_v4_save_options(sk, skb);
if (!want_cookie)
- TCP_ECN_create_request(req, skb->h.th);
+ TCP_ECN_create_request(req, tcp_hdr(skb));
if (want_cookie) {
#ifdef CONFIG_SYN_COOKIES
(dst = inet_csk_route_req(sk, req)) != NULL &&
(peer = rt_get_peer((struct rtable *)dst)) != NULL &&
peer->v4daddr == saddr) {
- if (xtime.tv_sec < peer->tcp_ts_stamp + TCP_PAWS_MSL &&
+ if (get_seconds() < peer->tcp_ts_stamp + TCP_PAWS_MSL &&
(s32)(peer->tcp_ts - req->ts_recent) >
TCP_PAWS_WINDOW) {
NET_INC_STATS_BH(LINUX_MIB_PAWSPASSIVEREJECTED);
LIMIT_NETDEBUG(KERN_DEBUG "TCP: drop open "
"request from %u.%u.%u.%u/%u\n",
NIPQUAD(saddr),
- ntohs(skb->h.th->source));
+ ntohs(tcp_hdr(skb)->source));
dst_release(dst);
goto drop_and_free;
}
- isn = tcp_v4_init_sequence(sk, skb);
+ isn = tcp_v4_init_sequence(skb);
}
tcp_rsk(req)->snt_isn = isn;
goto drop_and_free;
if (want_cookie) {
- reqsk_free(req);
+ reqsk_free(req);
} else {
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
}
drop_and_free:
reqsk_free(req);
drop:
- TCP_INC_STATS_BH(TCP_MIB_ATTEMPTFAILS);
return 0;
}
struct inet_sock *newinet;
struct tcp_sock *newtp;
struct sock *newsk;
+#ifdef CONFIG_TCP_MD5SIG
+ struct tcp_md5sig_key *key;
+#endif
if (sk_acceptq_is_full(sk))
goto exit_overflow;
if (!newsk)
goto exit;
+ newsk->sk_gso_type = SKB_GSO_TCPV4;
sk_setup_caps(newsk, dst);
newtp = tcp_sk(newsk);
newinet->opt = ireq->opt;
ireq->opt = NULL;
newinet->mc_index = inet_iif(skb);
- newinet->mc_ttl = skb->nh.iph->ttl;
- newtp->ext_header_len = 0;
+ newinet->mc_ttl = ip_hdr(skb)->ttl;
+ inet_csk(newsk)->icsk_ext_hdr_len = 0;
if (newinet->opt)
- newtp->ext_header_len = newinet->opt->optlen;
+ inet_csk(newsk)->icsk_ext_hdr_len = newinet->opt->optlen;
newinet->id = newtp->write_seq ^ jiffies;
+ tcp_mtup_init(newsk);
tcp_sync_mss(newsk, dst_mtu(dst));
newtp->advmss = dst_metric(dst, RTAX_ADVMSS);
tcp_initialize_rcv_mss(newsk);
+#ifdef CONFIG_TCP_MD5SIG
+ /* Copy over the MD5 key from the original socket */
+ if ((key = tcp_v4_md5_do_lookup(sk, newinet->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_v4_md5_do_add(newsk, inet_sk(sk)->daddr,
+ newkey, key->keylen);
+ }
+#endif
+
__inet_hash(&tcp_hashinfo, newsk, 0);
__inet_inherit_port(&tcp_hashinfo, sk, newsk);
static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
{
- struct tcphdr *th = skb->h.th;
- struct iphdr *iph = skb->nh.iph;
+ struct tcphdr *th = tcp_hdr(skb);
+ const struct iphdr *iph = ip_hdr(skb);
struct sock *nsk;
struct request_sock **prev;
/* Find possible connection requests. */
if (req)
return tcp_check_req(sk, skb, req, prev);
- nsk = __inet_lookup_established(&tcp_hashinfo, skb->nh.iph->saddr,
- th->source, skb->nh.iph->daddr,
- ntohs(th->dest), inet_iif(skb));
+ nsk = inet_lookup_established(&tcp_hashinfo, iph->saddr, th->source,
+ iph->daddr, th->dest, inet_iif(skb));
if (nsk) {
if (nsk->sk_state != TCP_TIME_WAIT) {
bh_lock_sock(nsk);
return nsk;
}
- inet_twsk_put((struct inet_timewait_sock *)nsk);
+ inet_twsk_put(inet_twsk(nsk));
return NULL;
}
return sk;
}
-static int tcp_v4_checksum_init(struct sk_buff *skb)
+static __sum16 tcp_v4_checksum_init(struct sk_buff *skb)
{
- if (skb->ip_summed == CHECKSUM_HW) {
- if (!tcp_v4_check(skb->h.th, skb->len, skb->nh.iph->saddr,
- skb->nh.iph->daddr, skb->csum)) {
+ const struct iphdr *iph = ip_hdr(skb);
+
+ if (skb->ip_summed == CHECKSUM_COMPLETE) {
+ if (!tcp_v4_check(skb->len, iph->saddr,
+ iph->daddr, skb->csum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
return 0;
}
}
- skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr, skb->nh.iph->daddr,
+ skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
skb->len, IPPROTO_TCP, 0);
if (skb->len <= 76) {
*/
int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
{
+ struct sock *rsk;
+#ifdef CONFIG_TCP_MD5SIG
+ /*
+ * We really want to reject the packet as early as possible
+ * if:
+ * o We're expecting an MD5'd packet and this is no MD5 tcp option
+ * o There is an MD5 option and we're not expecting one
+ */
+ if (tcp_v4_inbound_md5_hash(sk, skb))
+ goto discard;
+#endif
+
if (sk->sk_state == TCP_ESTABLISHED) { /* Fast path */
TCP_CHECK_TIMER(sk);
- if (tcp_rcv_established(sk, skb, skb->h.th, skb->len))
+ if (tcp_rcv_established(sk, skb, tcp_hdr(skb), skb->len)) {
+ rsk = sk;
goto reset;
+ }
TCP_CHECK_TIMER(sk);
return 0;
}
- if (skb->len < (skb->h.th->doff << 2) || tcp_checksum_complete(skb))
+ if (skb->len < tcp_hdrlen(skb) || tcp_checksum_complete(skb))
goto csum_err;
if (sk->sk_state == TCP_LISTEN) {
goto discard;
if (nsk != sk) {
- if (tcp_child_process(sk, nsk, skb))
+ if (tcp_child_process(sk, nsk, skb)) {
+ rsk = nsk;
goto reset;
+ }
return 0;
}
}
TCP_CHECK_TIMER(sk);
- if (tcp_rcv_state_process(sk, skb, skb->h.th, skb->len))
+ if (tcp_rcv_state_process(sk, skb, tcp_hdr(skb), skb->len)) {
+ rsk = sk;
goto reset;
+ }
TCP_CHECK_TIMER(sk);
return 0;
reset:
- tcp_v4_send_reset(skb);
+ tcp_v4_send_reset(rsk, skb);
discard:
kfree_skb(skb);
/* Be careful here. If this function gets more complicated and
int tcp_v4_rcv(struct sk_buff *skb)
{
+ const struct iphdr *iph;
struct tcphdr *th;
struct sock *sk;
int ret;
if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
goto discard_it;
- th = skb->h.th;
+ th = tcp_hdr(skb);
if (th->doff < sizeof(struct tcphdr) / 4)
goto bad_packet;
* Packet length and doff are validated by header prediction,
* provided case of th->doff==0 is eliminated.
* So, we defer the checks. */
- if ((skb->ip_summed != CHECKSUM_UNNECESSARY &&
- tcp_v4_checksum_init(skb)))
+ if (!skb_csum_unnecessary(skb) && tcp_v4_checksum_init(skb))
goto bad_packet;
- th = skb->h.th;
+ th = tcp_hdr(skb);
+ iph = ip_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 = skb->nh.iph->tos;
+ TCP_SKB_CB(skb)->flags = iph->tos;
TCP_SKB_CB(skb)->sacked = 0;
- sk = __inet_lookup(&tcp_hashinfo, skb->nh.iph->saddr, th->source,
- skb->nh.iph->daddr, ntohs(th->dest),
- inet_iif(skb));
-
+ sk = __inet_lookup(&tcp_hashinfo, iph->saddr, th->source,
+ iph->daddr, th->dest, inet_iif(skb));
if (!sk)
goto no_tcp_socket;
if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
goto discard_and_relse;
+ nf_reset(skb);
- if (sk_filter(sk, skb, 0))
+ if (sk_filter(sk, skb))
goto discard_and_relse;
skb->dev = NULL;
- bh_lock_sock(sk);
+ bh_lock_sock_nested(sk);
ret = 0;
if (!sock_owned_by_user(sk)) {
- if (!tcp_prequeue(sk, skb))
+#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_v4_do_rcv(sk, skb);
+ else
+#endif
+ {
+ if (!tcp_prequeue(sk, skb))
ret = tcp_v4_do_rcv(sk, skb);
+ }
} else
sk_add_backlog(sk, skb);
bh_unlock_sock(sk);
bad_packet:
TCP_INC_STATS_BH(TCP_MIB_INERRS);
} else {
- tcp_v4_send_reset(skb);
+ tcp_v4_send_reset(NULL, skb);
}
discard_it:
/* Discard frame. */
kfree_skb(skb);
- return 0;
+ return 0;
discard_and_relse:
sock_put(sk);
do_time_wait:
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
- inet_twsk_put((struct inet_timewait_sock *) sk);
+ 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((struct inet_timewait_sock *) sk);
+ inet_twsk_put(inet_twsk(sk));
goto discard_it;
}
- switch (tcp_timewait_state_process((struct inet_timewait_sock *)sk,
- skb, th)) {
+ switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
case TCP_TW_SYN: {
struct sock *sk2 = inet_lookup_listener(&tcp_hashinfo,
- skb->nh.iph->daddr,
- ntohs(th->dest),
+ iph->daddr, th->dest,
inet_iif(skb));
if (sk2) {
- inet_twsk_deschedule((struct inet_timewait_sock *)sk,
- &tcp_death_row);
- inet_twsk_put((struct inet_timewait_sock *)sk);
+ inet_twsk_deschedule(inet_twsk(sk), &tcp_death_row);
+ inet_twsk_put(inet_twsk(sk));
sk = sk2;
goto process;
}
goto discard_it;
}
-static void v4_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
-{
- struct sockaddr_in *sin = (struct sockaddr_in *) uaddr;
- struct inet_sock *inet = inet_sk(sk);
-
- sin->sin_family = AF_INET;
- sin->sin_addr.s_addr = inet->daddr;
- sin->sin_port = inet->dport;
-}
-
/* VJ's idea. Save last timestamp seen from this destination
* and hold it at least for normal timewait interval to use for duplicate
* segment detection in subsequent connections, before they enter synchronized
if (peer) {
if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 ||
- (peer->tcp_ts_stamp + TCP_PAWS_MSL < xtime.tv_sec &&
+ (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() &&
peer->tcp_ts_stamp <= tp->rx_opt.ts_recent_stamp)) {
peer->tcp_ts_stamp = tp->rx_opt.ts_recent_stamp;
peer->tcp_ts = tp->rx_opt.ts_recent;
const struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 ||
- (peer->tcp_ts_stamp + TCP_PAWS_MSL < xtime.tv_sec &&
+ (peer->tcp_ts_stamp + TCP_PAWS_MSL < get_seconds() &&
peer->tcp_ts_stamp <= tcptw->tw_ts_recent_stamp)) {
peer->tcp_ts_stamp = tcptw->tw_ts_recent_stamp;
peer->tcp_ts = tcptw->tw_ts_recent;
}
struct inet_connection_sock_af_ops ipv4_specific = {
- .queue_xmit = ip_queue_xmit,
- .send_check = tcp_v4_send_check,
- .rebuild_header = inet_sk_rebuild_header,
- .conn_request = tcp_v4_conn_request,
- .syn_recv_sock = tcp_v4_syn_recv_sock,
- .remember_stamp = tcp_v4_remember_stamp,
- .net_header_len = sizeof(struct iphdr),
- .setsockopt = ip_setsockopt,
- .getsockopt = ip_getsockopt,
- .addr2sockaddr = v4_addr2sockaddr,
- .sockaddr_len = sizeof(struct sockaddr_in),
+ .queue_xmit = ip_queue_xmit,
+ .send_check = tcp_v4_send_check,
+ .rebuild_header = inet_sk_rebuild_header,
+ .conn_request = tcp_v4_conn_request,
+ .syn_recv_sock = tcp_v4_syn_recv_sock,
+ .remember_stamp = tcp_v4_remember_stamp,
+ .net_header_len = sizeof(struct iphdr),
+ .setsockopt = ip_setsockopt,
+ .getsockopt = ip_getsockopt,
+ .addr2sockaddr = inet_csk_addr2sockaddr,
+ .sockaddr_len = sizeof(struct sockaddr_in),
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_ip_setsockopt,
+ .compat_getsockopt = compat_ip_getsockopt,
+#endif
+};
+
+#ifdef CONFIG_TCP_MD5SIG
+static struct tcp_sock_af_ops tcp_sock_ipv4_specific = {
+ .md5_lookup = tcp_v4_md5_lookup,
+ .calc_md5_hash = tcp_v4_calc_md5_hash,
+ .md5_add = tcp_v4_md5_add_func,
+ .md5_parse = tcp_v4_parse_md5_keys,
};
+#endif
/* NOTE: A lot of things set to zero explicitly by call to
* sk_alloc() so need not be done here.
sock_set_flag(sk, SOCK_USE_WRITE_QUEUE);
icsk->icsk_af_ops = &ipv4_specific;
+ icsk->icsk_sync_mss = tcp_sync_mss;
+#ifdef CONFIG_TCP_MD5SIG
+ tp->af_specific = &tcp_sock_ipv4_specific;
+#endif
sk->sk_sndbuf = sysctl_tcp_wmem[1];
sk->sk_rcvbuf = sysctl_tcp_rmem[1];
tcp_cleanup_congestion_control(sk);
/* Cleanup up the write buffer. */
- sk_stream_writequeue_purge(sk);
+ tcp_write_queue_purge(sk);
/* Cleans up our, hopefully empty, out_of_order_queue. */
- __skb_queue_purge(&tp->out_of_order_queue);
+ __skb_queue_purge(&tp->out_of_order_queue);
+
+#ifdef CONFIG_TCP_MD5SIG
+ /* Clean up the MD5 key list, if any */
+ if (tp->md5sig_info) {
+ tcp_v4_clear_md5_list(sk);
+ kfree(tp->md5sig_info);
+ tp->md5sig_info = NULL;
+ }
+#endif
+
+#ifdef CONFIG_NET_DMA
+ /* Cleans up our sk_async_wait_queue */
+ __skb_queue_purge(&sk->sk_async_wait_queue);
+#endif
/* Clean prequeue, it must be empty really */
__skb_queue_purge(&tp->ucopy.prequeue);
if (st->state == TCP_SEQ_STATE_OPENREQ) {
struct request_sock *req = cur;
- icsk = inet_csk(st->syn_wait_sk);
+ icsk = inet_csk(st->syn_wait_sk);
req = req->dl_next;
while (1) {
while (req) {
}
req = req->dl_next;
}
- if (++st->sbucket >= TCP_SYNQ_HSIZE)
+ if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries)
break;
get_req:
req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket];
st->state = TCP_SEQ_STATE_LISTENING;
read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
} else {
- icsk = inet_csk(sk);
+ icsk = inet_csk(sk);
read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
if (reqsk_queue_len(&icsk->icsk_accept_queue))
goto start_req;
cur = sk;
goto out;
}
- icsk = inet_csk(sk);
+ icsk = inet_csk(sk);
read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
if (reqsk_queue_len(&icsk->icsk_accept_queue)) {
start_req:
}
st->state = TCP_SEQ_STATE_TIME_WAIT;
inet_twsk_for_each(tw, node,
- &tcp_hashinfo.ehash[st->bucket + tcp_hashinfo.ehash_size].chain) {
+ &tcp_hashinfo.ehash[st->bucket].twchain) {
if (tw->tw_family != st->family) {
continue;
}
}
st->state = TCP_SEQ_STATE_TIME_WAIT;
- tw = tw_head(&tcp_hashinfo.ehash[st->bucket + tcp_hashinfo.ehash_size].chain);
+ tw = tw_head(&tcp_hashinfo.ehash[st->bucket].twchain);
goto get_tw;
found:
cur = sk;
while (rc && pos) {
rc = established_get_next(seq, rc);
--pos;
- }
+ }
return rc;
}
if (unlikely(afinfo == NULL))
return -EINVAL;
- s = kmalloc(sizeof(*s), GFP_KERNEL);
+ s = kzalloc(sizeof(*s), GFP_KERNEL);
if (!s)
return -ENOMEM;
- memset(s, 0, sizeof(*s));
s->family = afinfo->family;
s->seq_ops.start = tcp_seq_start;
s->seq_ops.next = tcp_seq_next;
afinfo->seq_fops->read = seq_read;
afinfo->seq_fops->llseek = seq_lseek;
afinfo->seq_fops->release = seq_release_private;
-
+
p = proc_net_fops_create(afinfo->name, S_IRUGO, afinfo->seq_fops);
if (p)
p->data = afinfo;
if (!afinfo)
return;
proc_net_remove(afinfo->name);
- memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
+ memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
}
static void get_openreq4(struct sock *sk, struct request_sock *req,
req);
}
-static void get_tcp4_sock(struct sock *sp, char *tmpbuf, int i)
+static void get_tcp4_sock(struct sock *sk, char *tmpbuf, int i)
{
int timer_active;
unsigned long timer_expires;
- struct tcp_sock *tp = tcp_sk(sp);
- const struct inet_connection_sock *icsk = inet_csk(sp);
- struct inet_sock *inet = inet_sk(sp);
- unsigned int dest = inet->daddr;
- unsigned int src = inet->rcv_saddr;
+ struct tcp_sock *tp = tcp_sk(sk);
+ const struct inet_connection_sock *icsk = inet_csk(sk);
+ struct inet_sock *inet = inet_sk(sk);
+ __be32 dest = inet->daddr;
+ __be32 src = inet->rcv_saddr;
__u16 destp = ntohs(inet->dport);
__u16 srcp = ntohs(inet->sport);
} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
timer_active = 4;
timer_expires = icsk->icsk_timeout;
- } else if (timer_pending(&sp->sk_timer)) {
+ } else if (timer_pending(&sk->sk_timer)) {
timer_active = 2;
- timer_expires = sp->sk_timer.expires;
+ timer_expires = sk->sk_timer.expires;
} else {
timer_active = 0;
timer_expires = jiffies;
sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X %02X %08X:%08X %02X:%08lX "
"%08X %5d %8d %lu %d %p %u %u %u %u %d",
- i, src, srcp, dest, destp, sp->sk_state,
- tp->write_seq - tp->snd_una, tp->rcv_nxt - tp->copied_seq,
+ i, src, srcp, dest, destp, sk->sk_state,
+ tp->write_seq - tp->snd_una,
+ sk->sk_state == TCP_LISTEN ? sk->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),
+ sock_i_uid(sk),
icsk->icsk_probes_out,
- sock_i_ino(sp),
- atomic_read(&sp->sk_refcnt), sp,
+ sock_i_ino(sk),
+ atomic_read(&sk->sk_refcnt), sk,
icsk->icsk_rto,
icsk->icsk_ack.ato,
(icsk->icsk_ack.quick << 1) | icsk->icsk_ack.pingpong,
tp->snd_ssthresh >= 0xFFFF ? -1 : tp->snd_ssthresh);
}
-static void get_timewait4_sock(struct inet_timewait_sock *tw, char *tmpbuf, int i)
+static void get_timewait4_sock(struct inet_timewait_sock *tw,
+ char *tmpbuf, int i)
{
- unsigned int dest, src;
+ __be32 dest, src;
__u16 destp, srcp;
int ttd = tw->tw_ttd - jiffies;
.sysctl_rmem = sysctl_tcp_rmem,
.max_header = MAX_TCP_HEADER,
.obj_size = sizeof(struct tcp_sock),
- .twsk_obj_size = sizeof(struct tcp_timewait_sock),
+ .twsk_prot = &tcp_timewait_sock_ops,
.rsk_prot = &tcp_request_sock_ops,
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_tcp_setsockopt,
+ .compat_getsockopt = compat_tcp_getsockopt,
+#endif
};
-
-
void __init tcp_v4_init(struct net_proto_family *ops)
{
- int err = sock_create_kern(PF_INET, SOCK_RAW, IPPROTO_TCP, &tcp_socket);
- if (err < 0)
+ if (inet_csk_ctl_sock_create(&tcp_socket, PF_INET, SOCK_RAW,
+ IPPROTO_TCP) < 0)
panic("Failed to create the TCP control socket.\n");
- tcp_socket->sk->sk_allocation = GFP_ATOMIC;
- inet_sk(tcp_socket->sk)->uc_ttl = -1;
-
- /* Unhash it so that IP input processing does not even
- * see it, we do not wish this socket to see incoming
- * packets.
- */
- tcp_socket->sk->sk_prot->unhash(tcp_socket->sk);
}
EXPORT_SYMBOL(ipv4_specific);
-EXPORT_SYMBOL(inet_bind_bucket_create);
EXPORT_SYMBOL(tcp_hashinfo);
EXPORT_SYMBOL(tcp_prot);
EXPORT_SYMBOL(tcp_unhash);
#endif
EXPORT_SYMBOL(sysctl_local_port_range);
EXPORT_SYMBOL(sysctl_tcp_low_latency);
-EXPORT_SYMBOL(sysctl_tcp_tw_reuse);