udp.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:23k
- /*
- * UDP over IPv6
- * Linux INET6 implementation
- *
- * Authors:
- * Pedro Roque <roque@di.fc.ul.pt>
- *
- * Based on linux/ipv4/udp.c
- *
- * $Id: udp.c,v 1.64.2.1 2002/03/05 12:47:34 davem Exp $
- *
- * Fixes:
- * Hideaki YOSHIFUJI : sin6_scope_id support
- *
- * 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/inet_common.h>
- #include <net/checksum.h>
- struct udp_mib udp_stats_in6[NR_CPUS*2];
- /* 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)
- {
- 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++) {
- struct sock *sk;
- int size;
- sk = udp_hash[result & (UDP_HTABLE_SIZE - 1)];
- if (!sk) {
- 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;
- do {
- if (++size >= best_size_so_far)
- goto next;
- } while ((sk = sk->next) != NULL);
- 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 {
- struct sock *sk2;
- int addr_type = ipv6_addr_type(&sk->net_pinfo.af_inet6.rcv_saddr);
- for (sk2 = udp_hash[snum & (UDP_HTABLE_SIZE - 1)];
- sk2 != NULL;
- sk2 = sk2->next) {
- if (sk2->num == snum &&
- sk2 != sk &&
- sk2->bound_dev_if == sk->bound_dev_if &&
- (!sk2->rcv_saddr ||
- addr_type == IPV6_ADDR_ANY ||
- !ipv6_addr_cmp(&sk->net_pinfo.af_inet6.rcv_saddr,
- &sk2->net_pinfo.af_inet6.rcv_saddr) ||
- (addr_type == IPV6_ADDR_MAPPED &&
- sk2->family == AF_INET &&
- sk->rcv_saddr == sk2->rcv_saddr)) &&
- (!sk2->reuse || !sk->reuse))
- goto fail;
- }
- }
- sk->num = snum;
- if (sk->pprev == NULL) {
- struct sock **skp = &udp_hash[snum & (UDP_HTABLE_SIZE - 1)];
- if ((sk->next = *skp) != NULL)
- (*skp)->pprev = &sk->next;
- *skp = sk;
- sk->pprev = skp;
- sock_prot_inc_use(sk->prot);
- sock_hold(sk);
- }
- 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->pprev) {
- if (sk->next)
- sk->next->pprev = sk->pprev;
- *sk->pprev = sk->next;
- sk->pprev = NULL;
- sk->num = 0;
- sock_prot_dec_use(sk->prot);
- __sock_put(sk);
- }
- 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;
- unsigned short hnum = ntohs(dport);
- int badness = -1;
- read_lock(&udp_hash_lock);
- for(sk = udp_hash[hnum & (UDP_HTABLE_SIZE - 1)]; sk != NULL; sk = sk->next) {
- if((sk->num == hnum) &&
- (sk->family == PF_INET6)) {
- struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
- int score = 0;
- if(sk->dport) {
- if(sk->dport != sport)
- continue;
- score++;
- }
- if(!ipv6_addr_any(&np->rcv_saddr)) {
- if(ipv6_addr_cmp(&np->rcv_saddr, daddr))
- continue;
- score++;
- }
- if(!ipv6_addr_any(&np->daddr)) {
- if(ipv6_addr_cmp(&np->daddr, saddr))
- continue;
- score++;
- }
- if(sk->bound_dev_if) {
- if(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;
- }
- /*
- *
- */
- int udpv6_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
- {
- struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
- struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
- struct in6_addr *daddr;
- struct in6_addr saddr;
- struct dst_entry *dst;
- struct flowi fl;
- struct ip6_flowlabel *flowlabel = NULL;
- int addr_type;
- int err;
- if (usin->sin6_family == AF_INET) {
- err = udp_connect(sk, uaddr, addr_len);
- goto ipv4_connected;
- }
- if (addr_len < SIN6_LEN_RFC2133)
- return -EINVAL;
- if (usin->sin6_family != AF_INET6)
- return -EAFNOSUPPORT;
- fl.fl6_flowlabel = 0;
- if (np->sndflow) {
- fl.fl6_flowlabel = usin->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;
- ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
- }
- }
- addr_type = ipv6_addr_type(&usin->sin6_addr);
- if (addr_type == IPV6_ADDR_ANY) {
- /*
- * connect to self
- */
- usin->sin6_addr.s6_addr[15] = 0x01;
- }
- daddr = &usin->sin6_addr;
- if (addr_type == IPV6_ADDR_MAPPED) {
- struct sockaddr_in sin;
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = daddr->s6_addr32[3];
- sin.sin_port = usin->sin6_port;
- err = udp_connect(sk, (struct sockaddr*) &sin, sizeof(sin));
- ipv4_connected:
- if (err < 0)
- return err;
-
- ipv6_addr_set(&np->daddr, 0, 0,
- htonl(0x0000ffff),
- sk->daddr);
- if(ipv6_addr_any(&np->saddr)) {
- ipv6_addr_set(&np->saddr, 0, 0,
- htonl(0x0000ffff),
- sk->saddr);
- }
- if(ipv6_addr_any(&np->rcv_saddr)) {
- ipv6_addr_set(&np->rcv_saddr, 0, 0,
- htonl(0x0000ffff),
- sk->rcv_saddr);
- }
- return 0;
- }
- if (addr_type&IPV6_ADDR_LINKLOCAL) {
- if (addr_len >= sizeof(struct sockaddr_in6) &&
- usin->sin6_scope_id) {
- if (sk->bound_dev_if && sk->bound_dev_if != usin->sin6_scope_id) {
- fl6_sock_release(flowlabel);
- return -EINVAL;
- }
- sk->bound_dev_if = usin->sin6_scope_id;
- if (!sk->bound_dev_if && (addr_type&IPV6_ADDR_MULTICAST))
- fl.oif = np->mcast_oif;
- }
- /* Connect to link-local address requires an interface */
- if (sk->bound_dev_if == 0)
- return -EINVAL;
- }
- ipv6_addr_copy(&np->daddr, daddr);
- np->flow_label = fl.fl6_flowlabel;
- sk->dport = usin->sin6_port;
- /*
- * Check for a route to destination an obtain the
- * destination cache for it.
- */
- fl.proto = IPPROTO_UDP;
- fl.fl6_dst = &np->daddr;
- fl.fl6_src = &saddr;
- fl.oif = sk->bound_dev_if;
- fl.uli_u.ports.dport = sk->dport;
- fl.uli_u.ports.sport = sk->sport;
- if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
- fl.oif = np->mcast_oif;
- if (flowlabel) {
- if (flowlabel->opt && flowlabel->opt->srcrt) {
- struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
- fl.fl6_dst = rt0->addr;
- }
- } else if (np->opt && np->opt->srcrt) {
- struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
- fl.fl6_dst = rt0->addr;
- }
- dst = ip6_route_output(sk, &fl);
- if ((err = dst->error) != 0) {
- dst_release(dst);
- fl6_sock_release(flowlabel);
- return err;
- }
- ip6_dst_store(sk, dst, fl.fl6_dst);
- /* get the source adddress used in the apropriate device */
- err = ipv6_get_saddr(dst, daddr, &saddr);
- if (err == 0) {
- if(ipv6_addr_any(&np->saddr))
- ipv6_addr_copy(&np->saddr, &saddr);
- if(ipv6_addr_any(&np->rcv_saddr)) {
- ipv6_addr_copy(&np->rcv_saddr, &saddr);
- sk->rcv_saddr = LOOPBACK4_IPV6;
- }
- sk->state = TCP_ESTABLISHED;
- }
- fl6_sock_release(flowlabel);
- return err;
- }
- static void udpv6_close(struct sock *sk, long timeout)
- {
- inet_sock_release(sk);
- }
- /*
- * This should be easy, if there is something there we
- * return it, otherwise we block.
- */
- int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, int len,
- int noblock, int flags, int *addr_len)
- {
- struct sk_buff *skb;
- int copied, err;
- if (addr_len)
- *addr_len=sizeof(struct sockaddr_in6);
-
- if (flags & MSG_ERRQUEUE)
- return ipv6_recv_error(sk, msg, len);
- 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);
- if (sk->protinfo.af_inet.cmsg_flags)
- ip_cmsg_recv(msg, skb);
- } else {
- memcpy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr,
- sizeof(struct in6_addr));
- if (sk->net_pinfo.af_inet6.rxopt.all)
- datagram_recv_ctl(sk, msg, skb);
- if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
- struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
- sin6->sin6_scope_id = opt->iif;
- }
- }
- }
- err = copied;
- 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->receive_queue.lock);
- if (skb == skb_peek(&sk->receive_queue)) {
- __skb_unlink(skb, &sk->receive_queue);
- clear = 1;
- }
- spin_unlock_irq(&sk->receive_queue.lock);
- if (clear)
- kfree_skb(skb);
- }
- /* Error for blocking case is chosen to masquerade
- as some normal condition.
- */
- err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
- UDP6_INC_STATS_USER(UdpInErrors);
- goto out_free;
- }
- void udpv6_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 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;
- if (!icmpv6_err_convert(type, code, &err) &&
- !sk->net_pinfo.af_inet6.recverr)
- goto out;
- if (sk->state!=TCP_ESTABLISHED &&
- !sk->net_pinfo.af_inet6.recverr)
- goto out;
- if (sk->net_pinfo.af_inet6.recverr)
- ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
- sk->err = err;
- sk->error_report(sk);
- out:
- sock_put(sk);
- }
- static inline int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
- {
- #if defined(CONFIG_FILTER)
- if (sk->filter && skb->ip_summed != CHECKSUM_UNNECESSARY) {
- if ((unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum))) {
- UDP6_INC_STATS_BH(UdpInErrors);
- IP6_INC_STATS_BH(Ip6InDiscards);
- kfree_skb(skb);
- return 0;
- }
- skb->ip_summed = CHECKSUM_UNNECESSARY;
- }
- #endif
- if (sock_queue_rcv_skb(sk,skb)<0) {
- UDP6_INC_STATS_BH(UdpInErrors);
- IP6_INC_STATS_BH(Ip6InDiscards);
- kfree_skb(skb);
- return 0;
- }
- IP6_INC_STATS_BH(Ip6InDelivers);
- UDP6_INC_STATS_BH(UdpInDatagrams);
- 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 sock *s = sk;
- unsigned short num = ntohs(loc_port);
- for(; s; s = s->next) {
- if(s->num == num) {
- struct ipv6_pinfo *np = &s->net_pinfo.af_inet6;
- if(s->dport) {
- if(s->dport != rmt_port)
- continue;
- }
- if(!ipv6_addr_any(&np->daddr) &&
- ipv6_addr_cmp(&np->daddr, rmt_addr))
- continue;
- if (s->bound_dev_if && s->bound_dev_if != dif)
- continue;
- if(!ipv6_addr_any(&np->rcv_saddr)) {
- if(ipv6_addr_cmp(&np->rcv_saddr, loc_addr) == 0)
- return s;
- }
- if(!inet6_mc_check(s, loc_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;
- struct sk_buff *buff;
- int dif;
- read_lock(&udp_hash_lock);
- sk = 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)
- goto free_skb;
- buff = NULL;
- sk2 = sk;
- while((sk2 = udp_v6_mcast_next(sk2->next, uh->dest, daddr,
- uh->source, saddr, dif))) {
- if (!buff) {
- buff = skb_clone(skb, GFP_ATOMIC);
- if (!buff)
- continue;
- }
- if (sock_queue_rcv_skb(sk2, buff) >= 0)
- buff = NULL;
- }
- if (buff)
- kfree_skb(buff);
- if (sock_queue_rcv_skb(sk, skb) < 0) {
- free_skb:
- kfree_skb(skb);
- }
- read_unlock(&udp_hash_lock);
- }
- int udpv6_rcv(struct sk_buff *skb)
- {
- 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) {
- /* IPv6 draft-v2 section 8.1 says that we SHOULD log
- this error. Well, it is reasonable.
- */
- if (net_ratelimit())
- printk(KERN_INFO "IPv6: udp checksum is 0n");
- 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)) {
- NETDEBUG(if (net_ratelimit()) 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_type(daddr) & IPV6_ADDR_MULTICAST) {
- 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 (skb->ip_summed != CHECKSUM_UNNECESSARY &&
- (unsigned short)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum)))
- goto discard;
- UDP6_INC_STATS_BH(UdpNoPorts);
- 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/%un", ulen, skb->len);
- discard:
- UDP6_INC_STATS_BH(UdpInErrors);
- kfree_skb(skb);
- return(0);
- }
- /*
- * Sending
- */
- struct udpv6fakehdr
- {
- struct udphdr uh;
- struct iovec *iov;
- __u32 wcheck;
- __u32 pl_len;
- struct in6_addr *daddr;
- };
- /*
- * with checksum
- */
- static int udpv6_getfrag(const void *data, struct in6_addr *addr,
- char *buff, unsigned int offset, unsigned int len)
- {
- struct udpv6fakehdr *udh = (struct udpv6fakehdr *) data;
- char *dst;
- int final = 0;
- int clen = len;
- dst = buff;
- if (offset) {
- offset -= sizeof(struct udphdr);
- } else {
- dst += sizeof(struct udphdr);
- final = 1;
- clen -= sizeof(struct udphdr);
- }
- if (csum_partial_copy_fromiovecend(dst, udh->iov, offset,
- clen, &udh->wcheck))
- return -EFAULT;
- if (final) {
- struct in6_addr *daddr;
-
- udh->wcheck = csum_partial((char *)udh, sizeof(struct udphdr),
- udh->wcheck);
- if (udh->daddr) {
- daddr = udh->daddr;
- } else {
- /*
- * use packet destination address
- * this should improve cache locality
- */
- daddr = addr + 1;
- }
- udh->uh.check = csum_ipv6_magic(addr, daddr,
- udh->pl_len, IPPROTO_UDP,
- udh->wcheck);
- if (udh->uh.check == 0)
- udh->uh.check = -1;
- memcpy(buff, udh, sizeof(struct udphdr));
- }
- return 0;
- }
- static int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, int ulen)
- {
- struct ipv6_txoptions opt_space;
- struct udpv6fakehdr udh;
- struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
- struct ipv6_txoptions *opt = NULL;
- struct ip6_flowlabel *flowlabel = NULL;
- struct flowi fl;
- int addr_len = msg->msg_namelen;
- struct in6_addr *daddr;
- int len = ulen + sizeof(struct udphdr);
- int addr_type;
- int hlimit = -1;
-
- int err;
-
- /* Rough check on arithmetic overflow,
- better check is made in ip6_build_xmit
- */
- if (ulen < 0 || ulen > INT_MAX - sizeof(struct udphdr))
- return -EMSGSIZE;
-
- fl.fl6_flowlabel = 0;
- fl.oif = 0;
- if (sin6) {
- if (sin6->sin6_family == AF_INET)
- return udp_sendmsg(sk, msg, ulen);
- if (addr_len < SIN6_LEN_RFC2133)
- return -EINVAL;
- if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
- return -EINVAL;
- if (sin6->sin6_port == 0)
- return -EINVAL;
- udh.uh.dest = 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->dst_cache. */
- if (sk->state == TCP_ESTABLISHED &&
- !ipv6_addr_cmp(daddr, &sk->net_pinfo.af_inet6.daddr))
- daddr = &sk->net_pinfo.af_inet6.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->state != TCP_ESTABLISHED)
- return -ENOTCONN;
- udh.uh.dest = sk->dport;
- daddr = &sk->net_pinfo.af_inet6.daddr;
- fl.fl6_flowlabel = np->flow_label;
- }
- addr_type = ipv6_addr_type(daddr);
- if (addr_type == IPV6_ADDR_MAPPED) {
- struct sockaddr_in sin;
- sin.sin_family = AF_INET;
- sin.sin_addr.s_addr = daddr->s6_addr32[3];
- sin.sin_port = udh.uh.dest;
- msg->msg_name = (struct sockaddr *)(&sin);
- msg->msg_namelen = sizeof(sin);
- fl6_sock_release(flowlabel);
- return udp_sendmsg(sk, msg, ulen);
- }
- udh.daddr = NULL;
- if (!fl.oif)
- fl.oif = sk->bound_dev_if;
- fl.fl6_src = NULL;
- if (msg->msg_controllen) {
- opt = &opt_space;
- memset(opt, 0, sizeof(struct ipv6_txoptions));
- 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);
- if (opt && opt->srcrt)
- udh.daddr = daddr;
- udh.uh.source = sk->sport;
- udh.uh.len = len < 0x10000 ? htons(len) : 0;
- udh.uh.check = 0;
- udh.iov = msg->msg_iov;
- udh.wcheck = 0;
- udh.pl_len = len;
- fl.proto = IPPROTO_UDP;
- fl.fl6_dst = daddr;
- if (fl.fl6_src == NULL && !ipv6_addr_any(&np->saddr))
- fl.fl6_src = &np->saddr;
- fl.uli_u.ports.dport = udh.uh.dest;
- fl.uli_u.ports.sport = udh.uh.source;
- err = ip6_build_xmit(sk, udpv6_getfrag, &udh, &fl, len, opt, hlimit,
- msg->msg_flags);
- fl6_sock_release(flowlabel);
- if (err < 0)
- return err;
- UDP6_INC_STATS_USER(UdpOutDatagrams);
- return ulen;
- }
- static struct inet6_protocol udpv6_protocol =
- {
- udpv6_rcv, /* UDP handler */
- udpv6_err, /* UDP error control */
- NULL, /* next */
- IPPROTO_UDP, /* protocol ID */
- 0, /* copy */
- NULL, /* data */
- "UDPv6" /* name */
- };
- #define LINE_LEN 190
- #define LINE_FMT "%-190sn"
- static void get_udp6_sock(struct sock *sp, char *tmpbuf, int i)
- {
- struct in6_addr *dest, *src;
- __u16 destp, srcp;
- dest = &sp->net_pinfo.af_inet6.daddr;
- src = &sp->net_pinfo.af_inet6.rcv_saddr;
- destp = ntohs(sp->dport);
- srcp = ntohs(sp->sport);
- sprintf(tmpbuf,
- "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
- "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
- 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->state,
- atomic_read(&sp->wmem_alloc), atomic_read(&sp->rmem_alloc),
- 0, 0L, 0,
- sock_i_uid(sp), 0,
- sock_i_ino(sp),
- atomic_read(&sp->refcnt), sp);
- }
- int udp6_get_info(char *buffer, char **start, off_t offset, int length)
- {
- int len = 0, num = 0, i;
- off_t pos = 0;
- off_t begin;
- char tmpbuf[LINE_LEN+2];
- if (offset < LINE_LEN+1)
- len += sprintf(buffer, LINE_FMT,
- " sl " /* 6 */
- "local_address " /* 38 */
- "remote_address " /* 38 */
- "st tx_queue rx_queue tr tm->when retrnsmt" /* 41 */
- " uid timeout inode"); /* 21 */
- /*----*/
- /*144 */
- pos = LINE_LEN+1;
- read_lock(&udp_hash_lock);
- for (i = 0; i < UDP_HTABLE_SIZE; i++) {
- struct sock *sk;
- for (sk = udp_hash[i]; sk; sk = sk->next, num++) {
- if (sk->family != PF_INET6)
- continue;
- pos += LINE_LEN+1;
- if (pos <= offset)
- continue;
- get_udp6_sock(sk, tmpbuf, i);
- len += sprintf(buffer+len, LINE_FMT, tmpbuf);
- if(len >= length)
- goto out;
- }
- }
- out:
- read_unlock(&udp_hash_lock);
- begin = len - (pos - offset);
- *start = buffer + begin;
- len -= begin;
- if(len > length)
- len = length;
- if (len < 0)
- len = 0;
- return len;
- }
- struct proto udpv6_prot = {
- name: "UDP",
- close: udpv6_close,
- connect: udpv6_connect,
- disconnect: udp_disconnect,
- ioctl: udp_ioctl,
- destroy: inet6_destroy_sock,
- setsockopt: ipv6_setsockopt,
- getsockopt: ipv6_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,
- };
- 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)
- {
- inet6_add_protocol(&udpv6_protocol);
- inet6_register_protosw(&udpv6_protosw);
- }