Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
new file mode 100644
index 0000000..e251d0b
--- /dev/null
+++ b/net/ipv6/udp.c
@@ -0,0 +1,1075 @@
+/*
+ * UDP over IPv6
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * Based on linux/ipv4/udp.c
+ *
+ * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $
+ *
+ * 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.
+ * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
+ * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 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/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/sched.h>
+#include <linux/net.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+
+#include <net/sock.h>
+#include <net/snmp.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/protocol.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+#include <net/addrconf.h>
+#include <net/ip.h>
+#include <net/udp.h>
+#include <net/raw.h>
+#include <net/inet_common.h>
+
+#include <net/ip6_checksum.h>
+#include <net/xfrm.h>
+
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+
+DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6);
+
+/* Grrr, addr_type already calculated by caller, but I don't want
+ * to add some silly "cookie" argument to this method just for that.
+ */
+static int udp_v6_get_port(struct sock *sk, unsigned short snum)
+{
+ struct sock *sk2;
+ struct hlist_node *node;
+
+ write_lock_bh(&udp_hash_lock);
+ if (snum == 0) {
+ int best_size_so_far, best, result, i;
+
+ if (udp_port_rover > sysctl_local_port_range[1] ||
+ udp_port_rover < sysctl_local_port_range[0])
+ udp_port_rover = sysctl_local_port_range[0];
+ best_size_so_far = 32767;
+ best = result = udp_port_rover;
+ for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
+ int size;
+ struct hlist_head *list;
+
+ list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)];
+ if (hlist_empty(list)) {
+ if (result > sysctl_local_port_range[1])
+ result = sysctl_local_port_range[0] +
+ ((result - sysctl_local_port_range[0]) &
+ (UDP_HTABLE_SIZE - 1));
+ goto gotit;
+ }
+ size = 0;
+ sk_for_each(sk2, node, list)
+ if (++size >= best_size_so_far)
+ goto next;
+ best_size_so_far = size;
+ best = result;
+ next:;
+ }
+ result = best;
+ for(;; result += UDP_HTABLE_SIZE) {
+ if (result > sysctl_local_port_range[1])
+ result = sysctl_local_port_range[0]
+ + ((result - sysctl_local_port_range[0]) &
+ (UDP_HTABLE_SIZE - 1));
+ if (!udp_lport_inuse(result))
+ break;
+ }
+gotit:
+ udp_port_rover = snum = result;
+ } else {
+ sk_for_each(sk2, node,
+ &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) {
+ if (inet_sk(sk2)->num == snum &&
+ sk2 != sk &&
+ (!sk2->sk_bound_dev_if ||
+ !sk->sk_bound_dev_if ||
+ sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
+ (!sk2->sk_reuse || !sk->sk_reuse) &&
+ ipv6_rcv_saddr_equal(sk, sk2))
+ goto fail;
+ }
+ }
+
+ inet_sk(sk)->num = snum;
+ if (sk_unhashed(sk)) {
+ sk_add_node(sk, &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]);
+ sock_prot_inc_use(sk->sk_prot);
+ }
+ write_unlock_bh(&udp_hash_lock);
+ return 0;
+
+fail:
+ write_unlock_bh(&udp_hash_lock);
+ return 1;
+}
+
+static void udp_v6_hash(struct sock *sk)
+{
+ BUG();
+}
+
+static void udp_v6_unhash(struct sock *sk)
+{
+ write_lock_bh(&udp_hash_lock);
+ if (sk_del_node_init(sk)) {
+ inet_sk(sk)->num = 0;
+ sock_prot_dec_use(sk->sk_prot);
+ }
+ write_unlock_bh(&udp_hash_lock);
+}
+
+static struct sock *udp_v6_lookup(struct in6_addr *saddr, u16 sport,
+ struct in6_addr *daddr, u16 dport, int dif)
+{
+ struct sock *sk, *result = NULL;
+ struct hlist_node *node;
+ unsigned short hnum = ntohs(dport);
+ int badness = -1;
+
+ read_lock(&udp_hash_lock);
+ sk_for_each(sk, node, &udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (inet->num == hnum && sk->sk_family == PF_INET6) {
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ int score = 0;
+ if (inet->dport) {
+ if (inet->dport != sport)
+ continue;
+ score++;
+ }
+ if (!ipv6_addr_any(&np->rcv_saddr)) {
+ if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
+ continue;
+ score++;
+ }
+ if (!ipv6_addr_any(&np->daddr)) {
+ if (!ipv6_addr_equal(&np->daddr, saddr))
+ continue;
+ score++;
+ }
+ if (sk->sk_bound_dev_if) {
+ if (sk->sk_bound_dev_if != dif)
+ continue;
+ score++;
+ }
+ if(score == 4) {
+ result = sk;
+ break;
+ } else if(score > badness) {
+ result = sk;
+ badness = score;
+ }
+ }
+ }
+ if (result)
+ sock_hold(result);
+ read_unlock(&udp_hash_lock);
+ return result;
+}
+
+/*
+ *
+ */
+
+static void udpv6_close(struct sock *sk, long timeout)
+{
+ sk_common_release(sk);
+}
+
+/*
+ * This should be easy, if there is something there we
+ * return it, otherwise we block.
+ */
+
+static int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
+ struct msghdr *msg, size_t len,
+ int noblock, int flags, int *addr_len)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct inet_sock *inet = inet_sk(sk);
+ struct sk_buff *skb;
+ size_t copied;
+ int err;
+
+ if (addr_len)
+ *addr_len=sizeof(struct sockaddr_in6);
+
+ if (flags & MSG_ERRQUEUE)
+ return ipv6_recv_error(sk, msg, len);
+
+try_again:
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (!skb)
+ goto out;
+
+ copied = skb->len - sizeof(struct udphdr);
+ if (copied > len) {
+ copied = len;
+ msg->msg_flags |= MSG_TRUNC;
+ }
+
+ if (skb->ip_summed==CHECKSUM_UNNECESSARY) {
+ err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
+ copied);
+ } else if (msg->msg_flags&MSG_TRUNC) {
+ if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
+ goto csum_copy_err;
+ err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov,
+ copied);
+ } else {
+ err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
+ if (err == -EINVAL)
+ goto csum_copy_err;
+ }
+ if (err)
+ goto out_free;
+
+ sock_recv_timestamp(msg, sk, skb);
+
+ /* Copy the address. */
+ if (msg->msg_name) {
+ struct sockaddr_in6 *sin6;
+
+ sin6 = (struct sockaddr_in6 *) msg->msg_name;
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_port = skb->h.uh->source;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0;
+
+ if (skb->protocol == htons(ETH_P_IP))
+ ipv6_addr_set(&sin6->sin6_addr, 0, 0,
+ htonl(0xffff), skb->nh.iph->saddr);
+ else {
+ ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
+ if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ sin6->sin6_scope_id = IP6CB(skb)->iif;
+ }
+
+ }
+ if (skb->protocol == htons(ETH_P_IP)) {
+ if (inet->cmsg_flags)
+ ip_cmsg_recv(msg, skb);
+ } else {
+ if (np->rxopt.all)
+ datagram_recv_ctl(sk, msg, skb);
+ }
+
+ err = copied;
+ if (flags & MSG_TRUNC)
+ err = skb->len - sizeof(struct udphdr);
+
+out_free:
+ skb_free_datagram(sk, skb);
+out:
+ return err;
+
+csum_copy_err:
+ /* Clear queue. */
+ if (flags&MSG_PEEK) {
+ int clear = 0;
+ spin_lock_irq(&sk->sk_receive_queue.lock);
+ if (skb == skb_peek(&sk->sk_receive_queue)) {
+ __skb_unlink(skb, &sk->sk_receive_queue);
+ clear = 1;
+ }
+ spin_unlock_irq(&sk->sk_receive_queue.lock);
+ if (clear)
+ kfree_skb(skb);
+ }
+
+ skb_free_datagram(sk, skb);
+
+ if (flags & MSG_DONTWAIT) {
+ UDP6_INC_STATS_USER(UDP_MIB_INERRORS);
+ return -EAGAIN;
+ }
+ goto try_again;
+}
+
+static void udpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ int type, int code, int offset, __u32 info)
+{
+ struct ipv6_pinfo *np;
+ struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data;
+ struct net_device *dev = skb->dev;
+ struct in6_addr *saddr = &hdr->saddr;
+ struct in6_addr *daddr = &hdr->daddr;
+ struct udphdr *uh = (struct udphdr*)(skb->data+offset);
+ struct sock *sk;
+ int err;
+
+ sk = udp_v6_lookup(daddr, uh->dest, saddr, uh->source, dev->ifindex);
+
+ if (sk == NULL)
+ return;
+
+ np = inet6_sk(sk);
+
+ if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
+ goto out;
+
+ if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
+ goto out;
+
+ if (np->recverr)
+ ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
+
+ sk->sk_err = err;
+ sk->sk_error_report(sk);
+out:
+ sock_put(sk);
+}
+
+static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
+{
+ if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
+ kfree_skb(skb);
+ return -1;
+ }
+
+ if (skb->ip_summed != CHECKSUM_UNNECESSARY) {
+ if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
+ UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
+ kfree_skb(skb);
+ return 0;
+ }
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+
+ if (sock_queue_rcv_skb(sk,skb)<0) {
+ UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
+ kfree_skb(skb);
+ return 0;
+ }
+ UDP6_INC_STATS_BH(UDP_MIB_INDATAGRAMS);
+ return 0;
+}
+
+static struct sock *udp_v6_mcast_next(struct sock *sk,
+ u16 loc_port, struct in6_addr *loc_addr,
+ u16 rmt_port, struct in6_addr *rmt_addr,
+ int dif)
+{
+ struct hlist_node *node;
+ struct sock *s = sk;
+ unsigned short num = ntohs(loc_port);
+
+ sk_for_each_from(s, node) {
+ struct inet_sock *inet = inet_sk(s);
+
+ if (inet->num == num && s->sk_family == PF_INET6) {
+ struct ipv6_pinfo *np = inet6_sk(s);
+ if (inet->dport) {
+ if (inet->dport != rmt_port)
+ continue;
+ }
+ if (!ipv6_addr_any(&np->daddr) &&
+ !ipv6_addr_equal(&np->daddr, rmt_addr))
+ continue;
+
+ if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
+ continue;
+
+ if (!ipv6_addr_any(&np->rcv_saddr)) {
+ if (ipv6_addr_equal(&np->rcv_saddr, loc_addr))
+ return s;
+ continue;
+ }
+ if(!inet6_mc_check(s, loc_addr, rmt_addr))
+ continue;
+ return s;
+ }
+ }
+ return NULL;
+}
+
+/*
+ * Note: called only from the BH handler context,
+ * so we don't need to lock the hashes.
+ */
+static void udpv6_mcast_deliver(struct udphdr *uh,
+ struct in6_addr *saddr, struct in6_addr *daddr,
+ struct sk_buff *skb)
+{
+ struct sock *sk, *sk2;
+ int dif;
+
+ read_lock(&udp_hash_lock);
+ sk = sk_head(&udp_hash[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
+ dif = skb->dev->ifindex;
+ sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
+ if (!sk) {
+ kfree_skb(skb);
+ goto out;
+ }
+
+ sk2 = sk;
+ while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr,
+ uh->source, saddr, dif))) {
+ struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC);
+ if (buff)
+ udpv6_queue_rcv_skb(sk2, buff);
+ }
+ udpv6_queue_rcv_skb(sk, skb);
+out:
+ read_unlock(&udp_hash_lock);
+}
+
+static int udpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
+{
+ struct sk_buff *skb = *pskb;
+ struct sock *sk;
+ struct udphdr *uh;
+ struct net_device *dev = skb->dev;
+ struct in6_addr *saddr, *daddr;
+ u32 ulen = 0;
+
+ if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+ goto short_packet;
+
+ saddr = &skb->nh.ipv6h->saddr;
+ daddr = &skb->nh.ipv6h->daddr;
+ uh = skb->h.uh;
+
+ ulen = ntohs(uh->len);
+
+ /* Check for jumbo payload */
+ if (ulen == 0)
+ ulen = skb->len;
+
+ if (ulen > skb->len || ulen < sizeof(*uh))
+ goto short_packet;
+
+ if (uh->check == 0) {
+ /* RFC 2460 section 8.1 says that we SHOULD log
+ this error. Well, it is reasonable.
+ */
+ LIMIT_NETDEBUG(
+ printk(KERN_INFO "IPv6: udp checksum is 0\n"));
+ goto discard;
+ }
+
+ if (ulen < skb->len) {
+ if (__pskb_trim(skb, ulen))
+ goto discard;
+ saddr = &skb->nh.ipv6h->saddr;
+ daddr = &skb->nh.ipv6h->daddr;
+ uh = skb->h.uh;
+ }
+
+ if (skb->ip_summed==CHECKSUM_HW) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ if (csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) {
+ LIMIT_NETDEBUG(printk(KERN_DEBUG "udp v6 hw csum failure.\n"));
+ skb->ip_summed = CHECKSUM_NONE;
+ }
+ }
+ if (skb->ip_summed != CHECKSUM_UNNECESSARY)
+ skb->csum = ~csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, 0);
+
+ /*
+ * Multicast receive code
+ */
+ if (ipv6_addr_is_multicast(daddr)) {
+ udpv6_mcast_deliver(uh, saddr, daddr, skb);
+ return 0;
+ }
+
+ /* Unicast */
+
+ /*
+ * check socket cache ... must talk to Alan about his plans
+ * for sock caches... i'll skip this for now.
+ */
+ sk = udp_v6_lookup(saddr, uh->source, daddr, uh->dest, dev->ifindex);
+
+ if (sk == NULL) {
+ if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto discard;
+
+ if (skb->ip_summed != CHECKSUM_UNNECESSARY &&
+ (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
+ goto discard;
+ UDP6_INC_STATS_BH(UDP_MIB_NOPORTS);
+
+ icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
+
+ kfree_skb(skb);
+ return(0);
+ }
+
+ /* deliver */
+
+ udpv6_queue_rcv_skb(sk, skb);
+ sock_put(sk);
+ return(0);
+
+short_packet:
+ if (net_ratelimit())
+ printk(KERN_DEBUG "UDP: short packet: %d/%u\n", ulen, skb->len);
+
+discard:
+ UDP6_INC_STATS_BH(UDP_MIB_INERRORS);
+ kfree_skb(skb);
+ return(0);
+}
+/*
+ * Throw away all pending data and cancel the corking. Socket is locked.
+ */
+static void udp_v6_flush_pending_frames(struct sock *sk)
+{
+ struct udp_sock *up = udp_sk(sk);
+
+ if (up->pending) {
+ up->len = 0;
+ up->pending = 0;
+ ip6_flush_pending_frames(sk);
+ }
+}
+
+/*
+ * Sending
+ */
+
+static int udp_v6_push_pending_frames(struct sock *sk, struct udp_sock *up)
+{
+ struct sk_buff *skb;
+ struct udphdr *uh;
+ struct inet_sock *inet = inet_sk(sk);
+ struct flowi *fl = &inet->cork.fl;
+ int err = 0;
+
+ /* Grab the skbuff where UDP header space exists. */
+ if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
+ goto out;
+
+ /*
+ * Create a UDP header
+ */
+ uh = skb->h.uh;
+ uh->source = fl->fl_ip_sport;
+ uh->dest = fl->fl_ip_dport;
+ uh->len = htons(up->len);
+ uh->check = 0;
+
+ if (sk->sk_no_check == UDP_CSUM_NOXMIT) {
+ skb->ip_summed = CHECKSUM_NONE;
+ goto send;
+ }
+
+ if (skb_queue_len(&sk->sk_write_queue) == 1) {
+ skb->csum = csum_partial((char *)uh,
+ sizeof(struct udphdr), skb->csum);
+ uh->check = csum_ipv6_magic(&fl->fl6_src,
+ &fl->fl6_dst,
+ up->len, fl->proto, skb->csum);
+ } else {
+ u32 tmp_csum = 0;
+
+ skb_queue_walk(&sk->sk_write_queue, skb) {
+ tmp_csum = csum_add(tmp_csum, skb->csum);
+ }
+ tmp_csum = csum_partial((char *)uh,
+ sizeof(struct udphdr), tmp_csum);
+ tmp_csum = csum_ipv6_magic(&fl->fl6_src,
+ &fl->fl6_dst,
+ up->len, fl->proto, tmp_csum);
+ uh->check = tmp_csum;
+
+ }
+ if (uh->check == 0)
+ uh->check = -1;
+
+send:
+ err = ip6_push_pending_frames(sk);
+out:
+ up->len = 0;
+ up->pending = 0;
+ return err;
+}
+
+static int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
+ struct msghdr *msg, size_t len)
+{
+ struct ipv6_txoptions opt_space;
+ struct udp_sock *up = udp_sk(sk);
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
+ struct in6_addr *daddr, *final_p = NULL, final;
+ struct ipv6_txoptions *opt = NULL;
+ struct ip6_flowlabel *flowlabel = NULL;
+ struct flowi *fl = &inet->cork.fl;
+ struct dst_entry *dst;
+ int addr_len = msg->msg_namelen;
+ int ulen = len;
+ int hlimit = -1;
+ int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
+ int err;
+
+ /* destination address check */
+ if (sin6) {
+ if (addr_len < offsetof(struct sockaddr, sa_data))
+ return -EINVAL;
+
+ switch (sin6->sin6_family) {
+ case AF_INET6:
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+ daddr = &sin6->sin6_addr;
+ break;
+ case AF_INET:
+ goto do_udp_sendmsg;
+ case AF_UNSPEC:
+ msg->msg_name = sin6 = NULL;
+ msg->msg_namelen = addr_len = 0;
+ daddr = NULL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ } else if (!up->pending) {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+ daddr = &np->daddr;
+ } else
+ daddr = NULL;
+
+ if (daddr) {
+ if (ipv6_addr_type(daddr) == IPV6_ADDR_MAPPED) {
+ struct sockaddr_in sin;
+ sin.sin_family = AF_INET;
+ sin.sin_port = sin6 ? sin6->sin6_port : inet->dport;
+ sin.sin_addr.s_addr = daddr->s6_addr32[3];
+ msg->msg_name = &sin;
+ msg->msg_namelen = sizeof(sin);
+do_udp_sendmsg:
+ if (__ipv6_only_sock(sk))
+ return -ENETUNREACH;
+ return udp_sendmsg(iocb, sk, msg, len);
+ }
+ }
+
+ if (up->pending == AF_INET)
+ return udp_sendmsg(iocb, sk, msg, len);
+
+ /* Rough check on arithmetic overflow,
+ better check is made in ip6_build_xmit
+ */
+ if (len > INT_MAX - sizeof(struct udphdr))
+ return -EMSGSIZE;
+
+ if (up->pending) {
+ /*
+ * There are pending frames.
+ * The socket lock must be held while it's corked.
+ */
+ lock_sock(sk);
+ if (likely(up->pending)) {
+ if (unlikely(up->pending != AF_INET6)) {
+ release_sock(sk);
+ return -EAFNOSUPPORT;
+ }
+ dst = NULL;
+ goto do_append_data;
+ }
+ release_sock(sk);
+ }
+ ulen += sizeof(struct udphdr);
+
+ memset(fl, 0, sizeof(*fl));
+
+ if (sin6) {
+ if (sin6->sin6_port == 0)
+ return -EINVAL;
+
+ fl->fl_ip_dport = sin6->sin6_port;
+ daddr = &sin6->sin6_addr;
+
+ if (np->sndflow) {
+ fl->fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
+ if (fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
+ flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
+ if (flowlabel == NULL)
+ return -EINVAL;
+ daddr = &flowlabel->dst;
+ }
+ }
+
+ /*
+ * Otherwise it will be difficult to maintain
+ * sk->sk_dst_cache.
+ */
+ if (sk->sk_state == TCP_ESTABLISHED &&
+ ipv6_addr_equal(daddr, &np->daddr))
+ daddr = &np->daddr;
+
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ sin6->sin6_scope_id &&
+ ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
+ fl->oif = sin6->sin6_scope_id;
+ } else {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+
+ fl->fl_ip_dport = inet->dport;
+ daddr = &np->daddr;
+ fl->fl6_flowlabel = np->flow_label;
+ }
+
+ if (!fl->oif)
+ fl->oif = sk->sk_bound_dev_if;
+
+ if (msg->msg_controllen) {
+ opt = &opt_space;
+ memset(opt, 0, sizeof(struct ipv6_txoptions));
+ opt->tot_len = sizeof(*opt);
+
+ err = datagram_send_ctl(msg, fl, opt, &hlimit);
+ if (err < 0) {
+ fl6_sock_release(flowlabel);
+ return err;
+ }
+ if ((fl->fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
+ flowlabel = fl6_sock_lookup(sk, fl->fl6_flowlabel);
+ if (flowlabel == NULL)
+ return -EINVAL;
+ }
+ if (!(opt->opt_nflen|opt->opt_flen))
+ opt = NULL;
+ }
+ if (opt == NULL)
+ opt = np->opt;
+ if (flowlabel)
+ opt = fl6_merge_options(&opt_space, flowlabel, opt);
+
+ fl->proto = IPPROTO_UDP;
+ ipv6_addr_copy(&fl->fl6_dst, daddr);
+ if (ipv6_addr_any(&fl->fl6_src) && !ipv6_addr_any(&np->saddr))
+ ipv6_addr_copy(&fl->fl6_src, &np->saddr);
+ fl->fl_ip_sport = inet->sport;
+
+ /* merge ip6_build_xmit from ip6_output */
+ 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;
+ }
+
+ if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst))
+ fl->oif = np->mcast_oif;
+
+ err = ip6_dst_lookup(sk, &dst, fl);
+ if (err)
+ goto out;
+ if (final_p)
+ ipv6_addr_copy(&fl->fl6_dst, final_p);
+
+ if ((err = xfrm_lookup(&dst, fl, sk, 0)) < 0) {
+ dst_release(dst);
+ goto out;
+ }
+
+ if (hlimit < 0) {
+ if (ipv6_addr_is_multicast(&fl->fl6_dst))
+ hlimit = np->mcast_hops;
+ else
+ hlimit = np->hop_limit;
+ if (hlimit < 0)
+ hlimit = dst_metric(dst, RTAX_HOPLIMIT);
+ if (hlimit < 0)
+ hlimit = ipv6_get_hoplimit(dst->dev);
+ }
+
+ if (msg->msg_flags&MSG_CONFIRM)
+ goto do_confirm;
+back_from_confirm:
+
+ lock_sock(sk);
+ if (unlikely(up->pending)) {
+ /* The socket is already corked while preparing it. */
+ /* ... which is an evident application bug. --ANK */
+ release_sock(sk);
+
+ LIMIT_NETDEBUG(printk(KERN_DEBUG "udp cork app bug 2\n"));
+ err = -EINVAL;
+ goto out;
+ }
+
+ up->pending = AF_INET6;
+
+do_append_data:
+ up->len += ulen;
+ err = ip6_append_data(sk, ip_generic_getfrag, msg->msg_iov, ulen, sizeof(struct udphdr),
+ hlimit, opt, fl, (struct rt6_info*)dst,
+ corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
+ if (err)
+ udp_v6_flush_pending_frames(sk);
+ else if (!corkreq)
+ err = udp_v6_push_pending_frames(sk, up);
+
+ if (dst)
+ ip6_dst_store(sk, dst,
+ ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ?
+ &np->daddr : NULL);
+ if (err > 0)
+ err = np->recverr ? net_xmit_errno(err) : 0;
+ release_sock(sk);
+out:
+ fl6_sock_release(flowlabel);
+ if (!err) {
+ UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS);
+ return len;
+ }
+ return err;
+
+do_confirm:
+ dst_confirm(dst);
+ if (!(msg->msg_flags&MSG_PROBE) || len)
+ goto back_from_confirm;
+ err = 0;
+ goto out;
+}
+
+static int udpv6_destroy_sock(struct sock *sk)
+{
+ lock_sock(sk);
+ udp_v6_flush_pending_frames(sk);
+ release_sock(sk);
+
+ inet6_destroy_sock(sk);
+
+ return 0;
+}
+
+/*
+ * Socket option code for UDP
+ */
+static int udpv6_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int optlen)
+{
+ struct udp_sock *up = udp_sk(sk);
+ int val;
+ int err = 0;
+
+ if (level != SOL_UDP)
+ return ipv6_setsockopt(sk, level, optname, optval, optlen);
+
+ if(optlen<sizeof(int))
+ return -EINVAL;
+
+ if (get_user(val, (int __user *)optval))
+ return -EFAULT;
+
+ switch(optname) {
+ case UDP_CORK:
+ if (val != 0) {
+ up->corkflag = 1;
+ } else {
+ up->corkflag = 0;
+ lock_sock(sk);
+ udp_v6_push_pending_frames(sk, up);
+ release_sock(sk);
+ }
+ break;
+
+ case UDP_ENCAP:
+ switch (val) {
+ case 0:
+ up->encap_type = val;
+ break;
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ }
+ break;
+
+ default:
+ err = -ENOPROTOOPT;
+ break;
+ };
+
+ return err;
+}
+
+static int udpv6_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct udp_sock *up = udp_sk(sk);
+ int val, len;
+
+ if (level != SOL_UDP)
+ return ipv6_getsockopt(sk, level, optname, optval, optlen);
+
+ if(get_user(len,optlen))
+ return -EFAULT;
+
+ len = min_t(unsigned int, len, sizeof(int));
+
+ if(len < 0)
+ return -EINVAL;
+
+ switch(optname) {
+ case UDP_CORK:
+ val = up->corkflag;
+ break;
+
+ case UDP_ENCAP:
+ val = up->encap_type;
+ break;
+
+ default:
+ return -ENOPROTOOPT;
+ };
+
+ if(put_user(len, optlen))
+ return -EFAULT;
+ if(copy_to_user(optval, &val,len))
+ return -EFAULT;
+ return 0;
+}
+
+static struct inet6_protocol udpv6_protocol = {
+ .handler = udpv6_rcv,
+ .err_handler = udpv6_err,
+ .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
+};
+
+/* ------------------------------------------------------------------------ */
+#ifdef CONFIG_PROC_FS
+
+static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
+{
+ struct inet_sock *inet = inet_sk(sp);
+ struct ipv6_pinfo *np = inet6_sk(sp);
+ struct in6_addr *dest, *src;
+ __u16 destp, srcp;
+
+ dest = &np->daddr;
+ src = &np->rcv_saddr;
+ destp = ntohs(inet->dport);
+ srcp = ntohs(inet->sport);
+ 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\n",
+ bucket,
+ 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,
+ atomic_read(&sp->sk_wmem_alloc),
+ atomic_read(&sp->sk_rmem_alloc),
+ 0, 0L, 0,
+ sock_i_uid(sp), 0,
+ sock_i_ino(sp),
+ atomic_read(&sp->sk_refcnt), sp);
+}
+
+static int udp6_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN)
+ seq_printf(seq,
+ " sl "
+ "local_address "
+ "remote_address "
+ "st tx_queue rx_queue tr tm->when retrnsmt"
+ " uid timeout inode\n");
+ else
+ udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
+ return 0;
+}
+
+static struct file_operations udp6_seq_fops;
+static struct udp_seq_afinfo udp6_seq_afinfo = {
+ .owner = THIS_MODULE,
+ .name = "udp6",
+ .family = AF_INET6,
+ .seq_show = udp6_seq_show,
+ .seq_fops = &udp6_seq_fops,
+};
+
+int __init udp6_proc_init(void)
+{
+ return udp_proc_register(&udp6_seq_afinfo);
+}
+
+void udp6_proc_exit(void) {
+ udp_proc_unregister(&udp6_seq_afinfo);
+}
+#endif /* CONFIG_PROC_FS */
+
+/* ------------------------------------------------------------------------ */
+
+struct proto udpv6_prot = {
+ .name = "UDPv6",
+ .owner = THIS_MODULE,
+ .close = udpv6_close,
+ .connect = ip6_datagram_connect,
+ .disconnect = udp_disconnect,
+ .ioctl = udp_ioctl,
+ .destroy = udpv6_destroy_sock,
+ .setsockopt = udpv6_setsockopt,
+ .getsockopt = udpv6_getsockopt,
+ .sendmsg = udpv6_sendmsg,
+ .recvmsg = udpv6_recvmsg,
+ .backlog_rcv = udpv6_queue_rcv_skb,
+ .hash = udp_v6_hash,
+ .unhash = udp_v6_unhash,
+ .get_port = udp_v6_get_port,
+ .obj_size = sizeof(struct udp6_sock),
+};
+
+extern struct proto_ops inet6_dgram_ops;
+
+static struct inet_protosw udpv6_protosw = {
+ .type = SOCK_DGRAM,
+ .protocol = IPPROTO_UDP,
+ .prot = &udpv6_prot,
+ .ops = &inet6_dgram_ops,
+ .capability =-1,
+ .no_check = UDP_CSUM_DEFAULT,
+ .flags = INET_PROTOSW_PERMANENT,
+};
+
+
+void __init udpv6_init(void)
+{
+ if (inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP) < 0)
+ printk(KERN_ERR "udpv6_init: Could not register protocol\n");
+ inet6_register_protosw(&udpv6_protosw);
+}