| /* |
| * UDP over IPv6 |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * Based on linux/ipv4/udp.c |
| * |
| * Fixes: |
| * Hideaki YOSHIFUJI : sin6_scope_id support |
| * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| * a single port at the same time. |
| * 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/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.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/module.h> |
| #include <linux/skbuff.h> |
| #include <linux/slab.h> |
| #include <asm/uaccess.h> |
| |
| #include <net/ndisc.h> |
| #include <net/protocol.h> |
| #include <net/transp_v6.h> |
| #include <net/ip6_route.h> |
| #include <net/raw.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> |
| #include "udp_impl.h" |
| |
| int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
| { |
| const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; |
| const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); |
| __be32 sk1_rcv_saddr = sk_rcv_saddr(sk); |
| __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); |
| int sk_ipv6only = ipv6_only_sock(sk); |
| int sk2_ipv6only = inet_v6_ipv6only(sk2); |
| int addr_type = ipv6_addr_type(sk_rcv_saddr6); |
| int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; |
| |
| /* if both are mapped, treat as IPv4 */ |
| if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) |
| return (!sk2_ipv6only && |
| (!sk1_rcv_saddr || !sk2_rcv_saddr || |
| sk1_rcv_saddr == sk2_rcv_saddr)); |
| |
| if (addr_type2 == IPV6_ADDR_ANY && |
| !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) |
| return 1; |
| |
| if (addr_type == IPV6_ADDR_ANY && |
| !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) |
| return 1; |
| |
| if (sk2_rcv_saddr6 && |
| ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) |
| return 1; |
| |
| return 0; |
| } |
| |
| static unsigned int udp6_portaddr_hash(struct net *net, |
| const struct in6_addr *addr6, |
| unsigned int port) |
| { |
| unsigned int hash, mix = net_hash_mix(net); |
| |
| if (ipv6_addr_any(addr6)) |
| hash = jhash_1word(0, mix); |
| else if (ipv6_addr_v4mapped(addr6)) |
| hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
| else |
| hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
| |
| return hash ^ port; |
| } |
| |
| |
| int udp_v6_get_port(struct sock *sk, unsigned short snum) |
| { |
| unsigned int hash2_nulladdr = |
| udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
| unsigned int hash2_partial = |
| udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); |
| |
| /* precompute partial secondary hash */ |
| udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); |
| } |
| |
| static void udp_v6_rehash(struct sock *sk) |
| { |
| u16 new_hash = udp6_portaddr_hash(sock_net(sk), |
| &inet6_sk(sk)->rcv_saddr, |
| inet_sk(sk)->inet_num); |
| |
| udp_lib_rehash(sk, new_hash); |
| } |
| |
| static inline int compute_score(struct sock *sk, struct net *net, |
| unsigned short hnum, |
| const struct in6_addr *saddr, __be16 sport, |
| const struct in6_addr *daddr, __be16 dport, |
| int dif) |
| { |
| int score = -1; |
| |
| if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
| sk->sk_family == PF_INET6) { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct inet_sock *inet = inet_sk(sk); |
| |
| score = 0; |
| if (inet->inet_dport) { |
| if (inet->inet_dport != sport) |
| return -1; |
| score++; |
| } |
| if (!ipv6_addr_any(&np->rcv_saddr)) { |
| if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) |
| return -1; |
| score++; |
| } |
| if (!ipv6_addr_any(&np->daddr)) { |
| if (!ipv6_addr_equal(&np->daddr, saddr)) |
| return -1; |
| score++; |
| } |
| if (sk->sk_bound_dev_if) { |
| if (sk->sk_bound_dev_if != dif) |
| return -1; |
| score++; |
| } |
| } |
| return score; |
| } |
| |
| #define SCORE2_MAX (1 + 1 + 1) |
| static inline int compute_score2(struct sock *sk, struct net *net, |
| const struct in6_addr *saddr, __be16 sport, |
| const struct in6_addr *daddr, unsigned short hnum, |
| int dif) |
| { |
| int score = -1; |
| |
| if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
| sk->sk_family == PF_INET6) { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct inet_sock *inet = inet_sk(sk); |
| |
| if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) |
| return -1; |
| score = 0; |
| if (inet->inet_dport) { |
| if (inet->inet_dport != sport) |
| return -1; |
| score++; |
| } |
| if (!ipv6_addr_any(&np->daddr)) { |
| if (!ipv6_addr_equal(&np->daddr, saddr)) |
| return -1; |
| score++; |
| } |
| if (sk->sk_bound_dev_if) { |
| if (sk->sk_bound_dev_if != dif) |
| return -1; |
| score++; |
| } |
| } |
| return score; |
| } |
| |
| |
| /* called with read_rcu_lock() */ |
| static struct sock *udp6_lib_lookup2(struct net *net, |
| const struct in6_addr *saddr, __be16 sport, |
| const struct in6_addr *daddr, unsigned int hnum, int dif, |
| struct udp_hslot *hslot2, unsigned int slot2) |
| { |
| struct sock *sk, *result; |
| struct hlist_nulls_node *node; |
| int score, badness; |
| |
| begin: |
| result = NULL; |
| badness = -1; |
| udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
| score = compute_score2(sk, net, saddr, sport, |
| daddr, hnum, dif); |
| if (score > badness) { |
| result = sk; |
| badness = score; |
| if (score == SCORE2_MAX) |
| goto exact_match; |
| } |
| } |
| /* |
| * if the nulls value we got at the end of this lookup is |
| * not the expected one, we must restart lookup. |
| * We probably met an item that was moved to another chain. |
| */ |
| if (get_nulls_value(node) != slot2) |
| goto begin; |
| |
| if (result) { |
| exact_match: |
| if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
| result = NULL; |
| else if (unlikely(compute_score2(result, net, saddr, sport, |
| daddr, hnum, dif) < badness)) { |
| sock_put(result); |
| goto begin; |
| } |
| } |
| return result; |
| } |
| |
| static struct sock *__udp6_lib_lookup(struct net *net, |
| const struct in6_addr *saddr, __be16 sport, |
| const struct in6_addr *daddr, __be16 dport, |
| int dif, struct udp_table *udptable) |
| { |
| struct sock *sk, *result; |
| struct hlist_nulls_node *node; |
| unsigned short hnum = ntohs(dport); |
| unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
| int score, badness; |
| |
| rcu_read_lock(); |
| if (hslot->count > 10) { |
| hash2 = udp6_portaddr_hash(net, daddr, hnum); |
| slot2 = hash2 & udptable->mask; |
| hslot2 = &udptable->hash2[slot2]; |
| if (hslot->count < hslot2->count) |
| goto begin; |
| |
| result = udp6_lib_lookup2(net, saddr, sport, |
| daddr, hnum, dif, |
| hslot2, slot2); |
| if (!result) { |
| hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); |
| slot2 = hash2 & udptable->mask; |
| hslot2 = &udptable->hash2[slot2]; |
| if (hslot->count < hslot2->count) |
| goto begin; |
| |
| result = udp6_lib_lookup2(net, saddr, sport, |
| &in6addr_any, hnum, dif, |
| hslot2, slot2); |
| } |
| rcu_read_unlock(); |
| return result; |
| } |
| begin: |
| result = NULL; |
| badness = -1; |
| sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
| score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
| if (score > badness) { |
| result = sk; |
| badness = score; |
| } |
| } |
| /* |
| * if the nulls value we got at the end of this lookup is |
| * not the expected one, we must restart lookup. |
| * We probably met an item that was moved to another chain. |
| */ |
| if (get_nulls_value(node) != slot) |
| goto begin; |
| |
| if (result) { |
| if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
| result = NULL; |
| else if (unlikely(compute_score(result, net, hnum, saddr, sport, |
| daddr, dport, dif) < badness)) { |
| sock_put(result); |
| goto begin; |
| } |
| } |
| rcu_read_unlock(); |
| return result; |
| } |
| |
| static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
| __be16 sport, __be16 dport, |
| struct udp_table *udptable) |
| { |
| struct sock *sk; |
| const struct ipv6hdr *iph = ipv6_hdr(skb); |
| |
| if (unlikely(sk = skb_steal_sock(skb))) |
| return sk; |
| return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
| &iph->daddr, dport, inet6_iif(skb), |
| udptable); |
| } |
| |
| struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
| const struct in6_addr *daddr, __be16 dport, int dif) |
| { |
| return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
| } |
| EXPORT_SYMBOL_GPL(udp6_lib_lookup); |
| |
| |
| /* |
| * This should be easy, if there is something there we |
| * return it, otherwise we block. |
| */ |
| |
| 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; |
| unsigned int ulen; |
| int peeked; |
| int err; |
| int is_udplite = IS_UDPLITE(sk); |
| int is_udp4; |
| bool slow; |
| |
| if (addr_len) |
| *addr_len=sizeof(struct sockaddr_in6); |
| |
| if (flags & MSG_ERRQUEUE) |
| return ipv6_recv_error(sk, msg, len); |
| |
| if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
| return ipv6_recv_rxpmtu(sk, msg, len); |
| |
| try_again: |
| skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
| &peeked, &err); |
| if (!skb) |
| goto out; |
| |
| ulen = skb->len - sizeof(struct udphdr); |
| if (len > ulen) |
| len = ulen; |
| else if (len < ulen) |
| msg->msg_flags |= MSG_TRUNC; |
| |
| is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
| |
| /* |
| * If checksum is needed at all, try to do it while copying the |
| * data. If the data is truncated, or if we only want a partial |
| * coverage checksum (UDP-Lite), do it before the copy. |
| */ |
| |
| if (len < ulen || UDP_SKB_CB(skb)->partial_cov) { |
| if (udp_lib_checksum_complete(skb)) |
| goto csum_copy_err; |
| } |
| |
| if (skb_csum_unnecessary(skb)) |
| err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
| msg->msg_iov,len); |
| 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; |
| |
| if (!peeked) { |
| if (is_udp4) |
| UDP_INC_STATS_USER(sock_net(sk), |
| UDP_MIB_INDATAGRAMS, is_udplite); |
| else |
| UDP6_INC_STATS_USER(sock_net(sk), |
| UDP_MIB_INDATAGRAMS, is_udplite); |
| } |
| |
| sock_recv_ts_and_drops(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 = udp_hdr(skb)->source; |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_scope_id = 0; |
| |
| if (is_udp4) |
| ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
| &sin6->sin6_addr); |
| else { |
| ipv6_addr_copy(&sin6->sin6_addr, |
| &ipv6_hdr(skb)->saddr); |
| if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| sin6->sin6_scope_id = IP6CB(skb)->iif; |
| } |
| |
| } |
| if (is_udp4) { |
| if (inet->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| } else { |
| if (np->rxopt.all) |
| datagram_recv_ctl(sk, msg, skb); |
| } |
| |
| err = len; |
| if (flags & MSG_TRUNC) |
| err = ulen; |
| |
| out_free: |
| skb_free_datagram_locked(sk, skb); |
| out: |
| return err; |
| |
| csum_copy_err: |
| slow = lock_sock_fast(sk); |
| if (!skb_kill_datagram(sk, skb, flags)) { |
| if (is_udp4) |
| UDP_INC_STATS_USER(sock_net(sk), |
| UDP_MIB_INERRORS, is_udplite); |
| else |
| UDP6_INC_STATS_USER(sock_net(sk), |
| UDP_MIB_INERRORS, is_udplite); |
| } |
| unlock_sock_fast(sk, slow); |
| |
| if (noblock) |
| return -EAGAIN; |
| |
| /* starting over for a new packet */ |
| msg->msg_flags &= ~MSG_TRUNC; |
| goto try_again; |
| } |
| |
| void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info, |
| struct udp_table *udptable) |
| { |
| struct ipv6_pinfo *np; |
| const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
| const struct in6_addr *saddr = &hdr->saddr; |
| const struct in6_addr *daddr = &hdr->daddr; |
| struct udphdr *uh = (struct udphdr*)(skb->data+offset); |
| struct sock *sk; |
| int err; |
| |
| sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
| saddr, uh->source, inet6_iif(skb), udptable); |
| 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__ void udpv6_err(struct sk_buff *skb, |
| struct inet6_skb_parm *opt, u8 type, |
| u8 code, int offset, __be32 info ) |
| { |
| __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
| } |
| |
| int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) |
| { |
| struct udp_sock *up = udp_sk(sk); |
| int rc; |
| int is_udplite = IS_UDPLITE(sk); |
| |
| if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) |
| sock_rps_save_rxhash(sk, skb); |
| |
| if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| goto drop; |
| |
| /* |
| * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). |
| */ |
| if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
| |
| if (up->pcrlen == 0) { /* full coverage was set */ |
| LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" |
| " %d while full coverage %d requested\n", |
| UDP_SKB_CB(skb)->cscov, skb->len); |
| goto drop; |
| } |
| if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
| LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " |
| "too small, need min %d\n", |
| UDP_SKB_CB(skb)->cscov, up->pcrlen); |
| goto drop; |
| } |
| } |
| |
| if (rcu_access_pointer(sk->sk_filter)) { |
| if (udp_lib_checksum_complete(skb)) |
| goto drop; |
| } |
| |
| if ((rc = ip_queue_rcv_skb(sk, skb)) < 0) { |
| /* Note that an ENOMEM error is charged twice */ |
| if (rc == -ENOMEM) |
| UDP6_INC_STATS_BH(sock_net(sk), |
| UDP_MIB_RCVBUFERRORS, is_udplite); |
| goto drop_no_sk_drops_inc; |
| } |
| |
| return 0; |
| drop: |
| atomic_inc(&sk->sk_drops); |
| drop_no_sk_drops_inc: |
| UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
| kfree_skb(skb); |
| return -1; |
| } |
| |
| static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
| __be16 loc_port, const struct in6_addr *loc_addr, |
| __be16 rmt_port, const struct in6_addr *rmt_addr, |
| int dif) |
| { |
| struct hlist_nulls_node *node; |
| struct sock *s = sk; |
| unsigned short num = ntohs(loc_port); |
| |
| sk_nulls_for_each_from(s, node) { |
| struct inet_sock *inet = inet_sk(s); |
| |
| if (!net_eq(sock_net(s), net)) |
| continue; |
| |
| if (udp_sk(s)->udp_port_hash == num && |
| s->sk_family == PF_INET6) { |
| struct ipv6_pinfo *np = inet6_sk(s); |
| if (inet->inet_dport) { |
| if (inet->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; |
| } |
| |
| static void flush_stack(struct sock **stack, unsigned int count, |
| struct sk_buff *skb, unsigned int final) |
| { |
| unsigned int i; |
| struct sock *sk; |
| struct sk_buff *skb1; |
| |
| for (i = 0; i < count; i++) { |
| skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
| |
| sk = stack[i]; |
| if (skb1) { |
| if (sk_rcvqueues_full(sk, skb1)) { |
| kfree_skb(skb1); |
| goto drop; |
| } |
| bh_lock_sock(sk); |
| if (!sock_owned_by_user(sk)) |
| udpv6_queue_rcv_skb(sk, skb1); |
| else if (sk_add_backlog(sk, skb1)) { |
| kfree_skb(skb1); |
| bh_unlock_sock(sk); |
| goto drop; |
| } |
| bh_unlock_sock(sk); |
| continue; |
| } |
| drop: |
| atomic_inc(&sk->sk_drops); |
| UDP6_INC_STATS_BH(sock_net(sk), |
| UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk)); |
| UDP6_INC_STATS_BH(sock_net(sk), |
| UDP_MIB_INERRORS, IS_UDPLITE(sk)); |
| } |
| } |
| /* |
| * Note: called only from the BH handler context, |
| * so we don't need to lock the hashes. |
| */ |
| static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
| const struct in6_addr *saddr, const struct in6_addr *daddr, |
| struct udp_table *udptable) |
| { |
| struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
| const struct udphdr *uh = udp_hdr(skb); |
| struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
| int dif; |
| unsigned int i, count = 0; |
| |
| spin_lock(&hslot->lock); |
| sk = sk_nulls_head(&hslot->head); |
| dif = inet6_iif(skb); |
| sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
| while (sk) { |
| stack[count++] = sk; |
| sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, |
| uh->source, saddr, dif); |
| if (unlikely(count == ARRAY_SIZE(stack))) { |
| if (!sk) |
| break; |
| flush_stack(stack, count, skb, ~0); |
| count = 0; |
| } |
| } |
| /* |
| * before releasing the lock, we must take reference on sockets |
| */ |
| for (i = 0; i < count; i++) |
| sock_hold(stack[i]); |
| |
| spin_unlock(&hslot->lock); |
| |
| if (count) { |
| flush_stack(stack, count, skb, count - 1); |
| |
| for (i = 0; i < count; i++) |
| sock_put(stack[i]); |
| } else { |
| kfree_skb(skb); |
| } |
| return 0; |
| } |
| |
| static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
| int proto) |
| { |
| int err; |
| |
| UDP_SKB_CB(skb)->partial_cov = 0; |
| UDP_SKB_CB(skb)->cscov = skb->len; |
| |
| if (proto == IPPROTO_UDPLITE) { |
| err = udplite_checksum_init(skb, uh); |
| if (err) |
| return err; |
| } |
| |
| 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"); |
| return 1; |
| } |
| if (skb->ip_summed == CHECKSUM_COMPLETE && |
| !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
| skb->len, proto, skb->csum)) |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| if (!skb_csum_unnecessary(skb)) |
| skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
| &ipv6_hdr(skb)->daddr, |
| skb->len, proto, 0)); |
| |
| return 0; |
| } |
| |
| int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
| int proto) |
| { |
| struct net *net = dev_net(skb->dev); |
| struct sock *sk; |
| struct udphdr *uh; |
| const struct in6_addr *saddr, *daddr; |
| u32 ulen = 0; |
| |
| if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| goto discard; |
| |
| saddr = &ipv6_hdr(skb)->saddr; |
| daddr = &ipv6_hdr(skb)->daddr; |
| uh = udp_hdr(skb); |
| |
| ulen = ntohs(uh->len); |
| if (ulen > skb->len) |
| goto short_packet; |
| |
| if (proto == IPPROTO_UDP) { |
| /* UDP validates ulen. */ |
| |
| /* Check for jumbo payload */ |
| if (ulen == 0) |
| ulen = skb->len; |
| |
| if (ulen < sizeof(*uh)) |
| goto short_packet; |
| |
| if (ulen < skb->len) { |
| if (pskb_trim_rcsum(skb, ulen)) |
| goto short_packet; |
| saddr = &ipv6_hdr(skb)->saddr; |
| daddr = &ipv6_hdr(skb)->daddr; |
| uh = udp_hdr(skb); |
| } |
| } |
| |
| if (udp6_csum_init(skb, uh, proto)) |
| goto discard; |
| |
| /* |
| * Multicast receive code |
| */ |
| if (ipv6_addr_is_multicast(daddr)) |
| return __udp6_lib_mcast_deliver(net, skb, |
| saddr, daddr, udptable); |
| |
| /* Unicast */ |
| |
| /* |
| * check socket cache ... must talk to Alan about his plans |
| * for sock caches... i'll skip this for now. |
| */ |
| sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
| |
| if (sk == NULL) { |
| if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| goto discard; |
| |
| if (udp_lib_checksum_complete(skb)) |
| goto discard; |
| UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, |
| proto == IPPROTO_UDPLITE); |
| |
| icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
| |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /* deliver */ |
| |
| if (sk_rcvqueues_full(sk, skb)) { |
| sock_put(sk); |
| goto discard; |
| } |
| bh_lock_sock(sk); |
| if (!sock_owned_by_user(sk)) |
| udpv6_queue_rcv_skb(sk, skb); |
| else if (sk_add_backlog(sk, skb)) { |
| atomic_inc(&sk->sk_drops); |
| bh_unlock_sock(sk); |
| sock_put(sk); |
| goto discard; |
| } |
| bh_unlock_sock(sk); |
| sock_put(sk); |
| return 0; |
| |
| short_packet: |
| LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
| proto == IPPROTO_UDPLITE ? "-Lite" : "", |
| saddr, |
| ntohs(uh->source), |
| ulen, |
| skb->len, |
| daddr, |
| ntohs(uh->dest)); |
| |
| discard: |
| UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static __inline__ int udpv6_rcv(struct sk_buff *skb) |
| { |
| return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
| } |
| |
| /* |
| * 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 == AF_INET) |
| udp_flush_pending_frames(sk); |
| else if (up->pending) { |
| up->len = 0; |
| up->pending = 0; |
| ip6_flush_pending_frames(sk); |
| } |
| } |
| |
| /** |
| * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
| * @sk: socket we are sending on |
| * @skb: sk_buff containing the filled-in UDP header |
| * (checksum field must be zeroed out) |
| */ |
| static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, |
| const struct in6_addr *saddr, |
| const struct in6_addr *daddr, int len) |
| { |
| unsigned int offset; |
| struct udphdr *uh = udp_hdr(skb); |
| __wsum csum = 0; |
| |
| if (skb_queue_len(&sk->sk_write_queue) == 1) { |
| /* Only one fragment on the socket. */ |
| skb->csum_start = skb_transport_header(skb) - skb->head; |
| skb->csum_offset = offsetof(struct udphdr, check); |
| uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); |
| } else { |
| /* |
| * HW-checksum won't work as there are two or more |
| * fragments on the socket so that all csums of sk_buffs |
| * should be together |
| */ |
| offset = skb_transport_offset(skb); |
| skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| |
| skb->ip_summed = CHECKSUM_NONE; |
| |
| skb_queue_walk(&sk->sk_write_queue, skb) { |
| csum = csum_add(csum, skb->csum); |
| } |
| |
| uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, |
| csum); |
| if (uh->check == 0) |
| uh->check = CSUM_MANGLED_0; |
| } |
| } |
| |
| /* |
| * Sending |
| */ |
| |
| static int udp_v6_push_pending_frames(struct sock *sk) |
| { |
| struct sk_buff *skb; |
| struct udphdr *uh; |
| struct udp_sock *up = udp_sk(sk); |
| struct inet_sock *inet = inet_sk(sk); |
| struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
| int err = 0; |
| int is_udplite = IS_UDPLITE(sk); |
| __wsum csum = 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 = udp_hdr(skb); |
| uh->source = fl6->fl6_sport; |
| uh->dest = fl6->fl6_dport; |
| uh->len = htons(up->len); |
| uh->check = 0; |
| |
| if (is_udplite) |
| csum = udplite_csum_outgoing(sk, skb); |
| else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
| udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, |
| up->len); |
| goto send; |
| } else |
| csum = udp_csum_outgoing(sk, skb); |
| |
| /* add protocol-dependent pseudo-header */ |
| uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
| up->len, fl6->flowi6_proto, csum); |
| if (uh->check == 0) |
| uh->check = CSUM_MANGLED_0; |
| |
| send: |
| err = ip6_push_pending_frames(sk); |
| if (err) { |
| if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { |
| UDP6_INC_STATS_USER(sock_net(sk), |
| UDP_MIB_SNDBUFERRORS, is_udplite); |
| err = 0; |
| } |
| } else |
| UDP6_INC_STATS_USER(sock_net(sk), |
| UDP_MIB_OUTDATAGRAMS, is_udplite); |
| out: |
| up->len = 0; |
| up->pending = 0; |
| return err; |
| } |
| |
| 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, final; |
| struct ipv6_txoptions *opt = NULL; |
| struct ip6_flowlabel *flowlabel = NULL; |
| struct flowi6 fl6; |
| struct dst_entry *dst; |
| int addr_len = msg->msg_namelen; |
| int ulen = len; |
| int hlimit = -1; |
| int tclass = -1; |
| int dontfrag = -1; |
| int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| int err; |
| int connected = 0; |
| int is_udplite = IS_UDPLITE(sk); |
| int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
| |
| /* 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_v4mapped(daddr)) { |
| struct sockaddr_in sin; |
| sin.sin_family = AF_INET; |
| sin.sin_port = sin6 ? sin6->sin6_port : inet->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_append_data(). |
| */ |
| 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(&fl6, 0, sizeof(fl6)); |
| |
| if (sin6) { |
| if (sin6->sin6_port == 0) |
| return -EINVAL; |
| |
| fl6.fl6_dport = sin6->sin6_port; |
| daddr = &sin6->sin6_addr; |
| |
| if (np->sndflow) { |
| fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { |
| flowlabel = fl6_sock_lookup(sk, 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) |
| fl6.flowi6_oif = sin6->sin6_scope_id; |
| } else { |
| if (sk->sk_state != TCP_ESTABLISHED) |
| return -EDESTADDRREQ; |
| |
| fl6.fl6_dport = inet->inet_dport; |
| daddr = &np->daddr; |
| fl6.flowlabel = np->flow_label; |
| connected = 1; |
| } |
| |
| if (!fl6.flowi6_oif) |
| fl6.flowi6_oif = sk->sk_bound_dev_if; |
| |
| if (!fl6.flowi6_oif) |
| fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; |
| |
| fl6.flowi6_mark = sk->sk_mark; |
| |
| if (msg->msg_controllen) { |
| opt = &opt_space; |
| memset(opt, 0, sizeof(struct ipv6_txoptions)); |
| opt->tot_len = sizeof(*opt); |
| |
| err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
| &hlimit, &tclass, &dontfrag); |
| if (err < 0) { |
| fl6_sock_release(flowlabel); |
| return err; |
| } |
| if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
| flowlabel = fl6_sock_lookup(sk, 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); |
| |
| fl6.flowi6_proto = sk->sk_protocol; |
| if (!ipv6_addr_any(daddr)) |
| ipv6_addr_copy(&fl6.daddr, daddr); |
| else |
| fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
| if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) |
| ipv6_addr_copy(&fl6.saddr, &np->saddr); |
| fl6.fl6_sport = inet->inet_sport; |
| |
| final_p = fl6_update_dst(&fl6, opt, &final); |
| if (final_p) |
| connected = 0; |
| |
| if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
| fl6.flowi6_oif = np->mcast_oif; |
| connected = 0; |
| } |
| |
| security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
| |
| dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| dst = NULL; |
| goto out; |
| } |
| |
| if (hlimit < 0) { |
| if (ipv6_addr_is_multicast(&fl6.daddr)) |
| hlimit = np->mcast_hops; |
| else |
| hlimit = np->hop_limit; |
| if (hlimit < 0) |
| hlimit = ip6_dst_hoplimit(dst); |
| } |
| |
| if (tclass < 0) |
| tclass = np->tclass; |
| |
| if (dontfrag < 0) |
| dontfrag = np->dontfrag; |
| |
| 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; |
| getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, |
| sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
| (struct rt6_info*)dst, |
| corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
| if (err) |
| udp_v6_flush_pending_frames(sk); |
| else if (!corkreq) |
| err = udp_v6_push_pending_frames(sk); |
| else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| up->pending = 0; |
| |
| if (dst) { |
| if (connected) { |
| ip6_dst_store(sk, dst, |
| ipv6_addr_equal(&fl6.daddr, &np->daddr) ? |
| &np->daddr : NULL, |
| #ifdef CONFIG_IPV6_SUBTREES |
| ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
| &np->saddr : |
| #endif |
| NULL); |
| } else { |
| dst_release(dst); |
| } |
| dst = NULL; |
| } |
| |
| if (err > 0) |
| err = np->recverr ? net_xmit_errno(err) : 0; |
| release_sock(sk); |
| out: |
| dst_release(dst); |
| fl6_sock_release(flowlabel); |
| if (!err) |
| return len; |
| /* |
| * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| * we don't have a good statistic (IpOutDiscards but it can be too many |
| * things). We could add another new stat but at least for now that |
| * seems like overkill. |
| */ |
| if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
| UDP6_INC_STATS_USER(sock_net(sk), |
| UDP_MIB_SNDBUFERRORS, is_udplite); |
| } |
| return err; |
| |
| do_confirm: |
| dst_confirm(dst); |
| if (!(msg->msg_flags&MSG_PROBE) || len) |
| goto back_from_confirm; |
| err = 0; |
| goto out; |
| } |
| |
| void udpv6_destroy_sock(struct sock *sk) |
| { |
| lock_sock(sk); |
| udp_v6_flush_pending_frames(sk); |
| release_sock(sk); |
| |
| inet6_destroy_sock(sk); |
| } |
| |
| /* |
| * Socket option code for UDP |
| */ |
| int udpv6_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| if (level == SOL_UDP || level == SOL_UDPLITE) |
| return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| udp_v6_push_pending_frames); |
| return ipv6_setsockopt(sk, level, optname, optval, optlen); |
| } |
| |
| #ifdef CONFIG_COMPAT |
| int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, unsigned int optlen) |
| { |
| if (level == SOL_UDP || level == SOL_UDPLITE) |
| return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| udp_v6_push_pending_frames); |
| return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
| } |
| #endif |
| |
| int udpv6_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| if (level == SOL_UDP || level == SOL_UDPLITE) |
| return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| return ipv6_getsockopt(sk, level, optname, optval, optlen); |
| } |
| |
| #ifdef CONFIG_COMPAT |
| int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
| char __user *optval, int __user *optlen) |
| { |
| if (level == SOL_UDP || level == SOL_UDPLITE) |
| return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
| } |
| #endif |
| |
| static int udp6_ufo_send_check(struct sk_buff *skb) |
| { |
| const struct ipv6hdr *ipv6h; |
| struct udphdr *uh; |
| |
| if (!pskb_may_pull(skb, sizeof(*uh))) |
| return -EINVAL; |
| |
| ipv6h = ipv6_hdr(skb); |
| uh = udp_hdr(skb); |
| |
| uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, |
| IPPROTO_UDP, 0); |
| skb->csum_start = skb_transport_header(skb) - skb->head; |
| skb->csum_offset = offsetof(struct udphdr, check); |
| skb->ip_summed = CHECKSUM_PARTIAL; |
| return 0; |
| } |
| |
| static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, u32 features) |
| { |
| struct sk_buff *segs = ERR_PTR(-EINVAL); |
| unsigned int mss; |
| unsigned int unfrag_ip6hlen, unfrag_len; |
| struct frag_hdr *fptr; |
| u8 *mac_start, *prevhdr; |
| u8 nexthdr; |
| u8 frag_hdr_sz = sizeof(struct frag_hdr); |
| int offset; |
| __wsum csum; |
| |
| mss = skb_shinfo(skb)->gso_size; |
| if (unlikely(skb->len <= mss)) |
| goto out; |
| |
| if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { |
| /* Packet is from an untrusted source, reset gso_segs. */ |
| int type = skb_shinfo(skb)->gso_type; |
| |
| if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || |
| !(type & (SKB_GSO_UDP)))) |
| goto out; |
| |
| skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); |
| |
| segs = NULL; |
| goto out; |
| } |
| |
| /* Do software UFO. Complete and fill in the UDP checksum as HW cannot |
| * do checksum of UDP packets sent as multiple IP fragments. |
| */ |
| offset = skb_checksum_start_offset(skb); |
| csum = skb_checksum(skb, offset, skb->len- offset, 0); |
| offset += skb->csum_offset; |
| *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
| skb->ip_summed = CHECKSUM_NONE; |
| |
| /* Check if there is enough headroom to insert fragment header. */ |
| if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) && |
| pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) |
| goto out; |
| |
| /* Find the unfragmentable header and shift it left by frag_hdr_sz |
| * bytes to insert fragment header. |
| */ |
| unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); |
| nexthdr = *prevhdr; |
| *prevhdr = NEXTHDR_FRAGMENT; |
| unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + |
| unfrag_ip6hlen; |
| mac_start = skb_mac_header(skb); |
| memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); |
| |
| skb->mac_header -= frag_hdr_sz; |
| skb->network_header -= frag_hdr_sz; |
| |
| fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); |
| fptr->nexthdr = nexthdr; |
| fptr->reserved = 0; |
| ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb)); |
| |
| /* Fragment the skb. ipv6 header and the remaining fields of the |
| * fragment header are updated in ipv6_gso_segment() |
| */ |
| segs = skb_segment(skb, features); |
| |
| out: |
| return segs; |
| } |
| |
| static const struct inet6_protocol udpv6_protocol = { |
| .handler = udpv6_rcv, |
| .err_handler = udpv6_err, |
| .gso_send_check = udp6_ufo_send_check, |
| .gso_segment = udp6_ufo_fragment, |
| .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); |
| const struct in6_addr *dest, *src; |
| __u16 destp, srcp; |
| |
| dest = &np->daddr; |
| src = &np->rcv_saddr; |
| destp = ntohs(inet->inet_dport); |
| srcp = ntohs(inet->inet_sport); |
| seq_printf(seq, |
| "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\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, |
| sk_wmem_alloc_get(sp), |
| sk_rmem_alloc_get(sp), |
| 0, 0L, 0, |
| sock_i_uid(sp), 0, |
| sock_i_ino(sp), |
| atomic_read(&sp->sk_refcnt), sp, |
| atomic_read(&sp->sk_drops)); |
| } |
| |
| 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 ref pointer drops\n"); |
| else |
| udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); |
| return 0; |
| } |
| |
| static struct udp_seq_afinfo udp6_seq_afinfo = { |
| .name = "udp6", |
| .family = AF_INET6, |
| .udp_table = &udp_table, |
| .seq_fops = { |
| .owner = THIS_MODULE, |
| }, |
| .seq_ops = { |
| .show = udp6_seq_show, |
| }, |
| }; |
| |
| int __net_init udp6_proc_init(struct net *net) |
| { |
| return udp_proc_register(net, &udp6_seq_afinfo); |
| } |
| |
| void udp6_proc_exit(struct net *net) { |
| udp_proc_unregister(net, &udp6_seq_afinfo); |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| struct proto udpv6_prot = { |
| .name = "UDPv6", |
| .owner = THIS_MODULE, |
| .close = udp_lib_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_lib_hash, |
| .unhash = udp_lib_unhash, |
| .rehash = udp_v6_rehash, |
| .get_port = udp_v6_get_port, |
| .memory_allocated = &udp_memory_allocated, |
| .sysctl_mem = sysctl_udp_mem, |
| .sysctl_wmem = &sysctl_udp_wmem_min, |
| .sysctl_rmem = &sysctl_udp_rmem_min, |
| .obj_size = sizeof(struct udp6_sock), |
| .slab_flags = SLAB_DESTROY_BY_RCU, |
| .h.udp_table = &udp_table, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_udpv6_setsockopt, |
| .compat_getsockopt = compat_udpv6_getsockopt, |
| #endif |
| .clear_sk = sk_prot_clear_portaddr_nulls, |
| }; |
| |
| static struct inet_protosw udpv6_protosw = { |
| .type = SOCK_DGRAM, |
| .protocol = IPPROTO_UDP, |
| .prot = &udpv6_prot, |
| .ops = &inet6_dgram_ops, |
| .no_check = UDP_CSUM_DEFAULT, |
| .flags = INET_PROTOSW_PERMANENT, |
| }; |
| |
| |
| int __init udpv6_init(void) |
| { |
| int ret; |
| |
| ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
| if (ret) |
| goto out; |
| |
| ret = inet6_register_protosw(&udpv6_protosw); |
| if (ret) |
| goto out_udpv6_protocol; |
| out: |
| return ret; |
| |
| out_udpv6_protocol: |
| inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| goto out; |
| } |
| |
| void udpv6_exit(void) |
| { |
| inet6_unregister_protosw(&udpv6_protosw); |
| inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| } |