| /* |
| * 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 <linux/skbuff.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/tcp_states.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) __read_mostly; |
| |
| /* 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(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, 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; |
| } |
| if (i >= (1 << 16) / UDP_HTABLE_SIZE) |
| goto fail; |
| 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 (__skb_checksum_complete(skb)) |
| 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: |
| skb_kill_datagram(sk, skb, flags); |
| |
| 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_checksum_complete(skb)) { |
| UDP6_INC_STATS_BH(UDP_MIB_INERRORS); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| 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)) |
| 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) |
| { |
| 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(KERN_INFO "IPv6: udp checksum is 0\n"); |
| goto discard; |
| } |
| |
| if (ulen < skb->len) { |
| if (pskb_trim_rcsum(skb, ulen)) |
| goto discard; |
| saddr = &skb->nh.ipv6h->saddr; |
| daddr = &skb->nh.ipv6h->daddr; |
| uh = skb->h.uh; |
| } |
| |
| if (skb->ip_summed == CHECKSUM_HW && |
| !csum_ipv6_magic(saddr, daddr, ulen, IPPROTO_UDP, skb->csum)) |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| 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_checksum_complete(skb)) |
| 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 tclass = -1; |
| int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| int err; |
| int connected = 0; |
| |
| /* 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; |
| connected = 1; |
| } |
| |
| 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, &tclass); |
| 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; |
| connected = 0; |
| } |
| if (opt == NULL) |
| opt = np->opt; |
| if (flowlabel) |
| opt = fl6_merge_options(&opt_space, flowlabel, opt); |
| opt = ipv6_fixup_options(&opt_space, 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; |
| connected = 0; |
| } |
| |
| if (!fl->oif && ipv6_addr_is_multicast(&fl->fl6_dst)) { |
| fl->oif = np->mcast_oif; |
| connected = 0; |
| } |
| |
| 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) |
| 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 (tclass < 0) { |
| tclass = np->tclass; |
| if (tclass < 0) |
| tclass = 0; |
| } |
| |
| 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(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, tclass, 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) { |
| if (connected) { |
| ip6_dst_store(sk, dst, |
| ipv6_addr_equal(&fl->fl6_dst, &np->daddr) ? |
| &np->daddr : NULL); |
| } else { |
| dst_release(dst); |
| } |
| } |
| |
| 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), |
| }; |
| |
| 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); |
| } |