X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=net%2Fipv6%2Ficmp.c;h=1044b6fce0d5d472b11b0eef3a2e261650869e5e;hb=43bc926fffd92024b46cafaf7350d669ba9ca884;hp=26273c82f9fc3c348cb10e8b6b1f7fc97a9a2b6e;hpb=c7b5ebbddf7bcd3651947760f423e3783bbe6573;p=linux-2.6.git diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index 26273c82f..1044b6fce 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -42,6 +42,7 @@ #include #include #include +#include #ifdef CONFIG_SYSCTL #include @@ -67,7 +68,7 @@ #include #include -DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); +DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics) __read_mostly; /* * The ICMP socket(s). This is the most convenient way to flow control @@ -79,7 +80,7 @@ DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6_statistics); static DEFINE_PER_CPU(struct socket *, __icmpv6_socket) = NULL; #define icmpv6_socket __get_cpu_var(__icmpv6_socket) -static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp); +static int icmpv6_rcv(struct sk_buff **pskb); static struct inet6_protocol icmpv6_protocol = { .handler = icmpv6_rcv, @@ -135,7 +136,7 @@ static int is_ineligible(struct sk_buff *skb) if (len < 0) return 1; - ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr, len); + ptr = ipv6_skip_exthdr(skb, ptr, &nexthdr); if (ptr < 0) return 0; if (nexthdr == IPPROTO_ICMPV6) { @@ -211,7 +212,7 @@ static __inline__ int opt_unrec(struct sk_buff *skb, __u32 offset) return (*op & 0xC0) == 0x80; } -int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) +static int icmpv6_push_pending_frames(struct sock *sk, struct flowi *fl, struct icmp6hdr *thdr, int len) { struct sk_buff *skb; struct icmp6hdr *icmp6h; @@ -255,6 +256,7 @@ out: struct icmpv6_msg { struct sk_buff *skb; int offset; + uint8_t type; }; static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb) @@ -266,6 +268,8 @@ static int icmpv6_getfrag(void *from, char *to, int offset, int len, int odd, st csum = skb_copy_and_csum_bits(org_skb, msg->offset + offset, to, len, csum); skb->csum = csum_block_add(skb->csum, csum, odd); + if (!(msg->type & ICMPV6_INFOMSG_MASK)) + nf_ct_attach(skb, org_skb); return 0; } @@ -277,8 +281,8 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, { struct inet6_dev *idev = NULL; struct ipv6hdr *hdr = skb->nh.ipv6h; - struct sock *sk = icmpv6_socket->sk; - struct ipv6_pinfo *np = inet6_sk(sk); + struct sock *sk; + struct ipv6_pinfo *np; struct in6_addr *saddr = NULL; struct dst_entry *dst; struct icmp6hdr tmp_hdr; @@ -287,7 +291,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, int iif = 0; int addr_type = 0; int len; - int hlimit = -1; + int hlimit, tclass; int err = 0; if ((u8*)hdr < skb->head || (u8*)(hdr+1) > skb->tail) @@ -328,12 +332,13 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, iif = skb->dev->ifindex; /* - * Must not send if we know that source is Anycast also. - * for now we don't know that. + * Must not send error if the source does not uniquely + * identify a single node (RFC2463 Section 2.4). + * We check unspecified / multicast addresses here, + * and anycast addresses will be checked later. */ if ((addr_type == IPV6_ADDR_ANY) || (addr_type & IPV6_ADDR_MULTICAST)) { - LIMIT_NETDEBUG( - printk(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n")); + LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: addr_any/mcast source\n"); return; } @@ -341,8 +346,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, * Never answer to a ICMP packet. */ if (is_ineligible(skb)) { - LIMIT_NETDEBUG( - printk(KERN_DEBUG "icmpv6_send: no reply to icmp error\n")); + LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: no reply to icmp error\n"); return; } @@ -358,6 +362,9 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, if (icmpv6_xmit_lock()) return; + sk = icmpv6_socket->sk; + np = inet6_sk(sk); + if (!icmpv6_xrlim_allow(sk, type, &fl)) goto out; @@ -372,26 +379,40 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, err = ip6_dst_lookup(sk, &dst, &fl); if (err) goto out; - if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) - goto out_dst_release; - 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); + /* + * We won't send icmp if the destination is known + * anycast. + */ + if (((struct rt6_info *)dst)->rt6i_flags & RTF_ANYCAST) { + LIMIT_NETDEBUG(KERN_DEBUG "icmpv6_send: acast source\n"); + goto out_dst_release; } + if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) + goto out; + + 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); + + tclass = np->cork.tclass; + if (tclass < 0) + tclass = 0; + msg.skb = skb; msg.offset = skb->nh.raw - skb->data; + msg.type = type; len = skb->len - msg.offset; len = min_t(unsigned int, len, IPV6_MIN_MTU - sizeof(struct ipv6hdr) -sizeof(struct icmp6hdr)); if (len < 0) { - LIMIT_NETDEBUG( - printk(KERN_DEBUG "icmp: len problem\n")); + LIMIT_NETDEBUG(KERN_DEBUG "icmp: len problem\n"); goto out_dst_release; } @@ -400,7 +421,7 @@ void icmpv6_send(struct sk_buff *skb, int type, int code, __u32 info, err = ip6_append_data(sk, icmpv6_getfrag, &msg, len + sizeof(struct icmp6hdr), sizeof(struct icmp6hdr), - hlimit, NULL, &fl, (struct rt6_info*)dst, + hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, MSG_DONTWAIT); if (err) { ip6_flush_pending_frames(sk); @@ -423,9 +444,9 @@ out: static void icmpv6_echo_reply(struct sk_buff *skb) { - struct sock *sk = icmpv6_socket->sk; + struct sock *sk; struct inet6_dev *idev; - struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_pinfo *np; struct in6_addr *saddr = NULL; struct icmp6hdr *icmph = (struct icmp6hdr *) skb->h.raw; struct icmp6hdr tmp_hdr; @@ -433,7 +454,8 @@ static void icmpv6_echo_reply(struct sk_buff *skb) struct icmpv6_msg msg; struct dst_entry *dst; int err = 0; - int hlimit = -1; + int hlimit; + int tclass; saddr = &skb->nh.ipv6h->daddr; @@ -454,6 +476,9 @@ static void icmpv6_echo_reply(struct sk_buff *skb) if (icmpv6_xmit_lock()) return; + sk = icmpv6_socket->sk; + np = inet6_sk(sk); + if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) fl.oif = np->mcast_oif; @@ -461,24 +486,29 @@ static void icmpv6_echo_reply(struct sk_buff *skb) if (err) goto out; if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) - goto out_dst_release; + 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 (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); + + tclass = np->cork.tclass; + if (tclass < 0) + tclass = 0; idev = in6_dev_get(skb->dev); msg.skb = skb; msg.offset = 0; + msg.type = ICMPV6_ECHO_REPLY; err = ip6_append_data(sk, icmpv6_getfrag, &msg, skb->len + sizeof(struct icmp6hdr), - sizeof(struct icmp6hdr), hlimit, NULL, &fl, + sizeof(struct icmp6hdr), hlimit, tclass, NULL, &fl, (struct rt6_info*)dst, MSG_DONTWAIT); if (err) { @@ -493,7 +523,6 @@ static void icmpv6_echo_reply(struct sk_buff *skb) out_put: if (likely(idev != NULL)) in6_dev_put(idev); -out_dst_release: dst_release(dst); out: icmpv6_xmit_unlock(); @@ -514,7 +543,7 @@ static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info) nexthdr = ((struct ipv6hdr *)skb->data)->nexthdr; if (ipv6_ext_hdr(nexthdr)) { /* now skip over extension headers */ - inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, skb->len - sizeof(struct ipv6hdr)); + inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr); if (inner_offset<0) return; } else { @@ -545,7 +574,8 @@ static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info) read_lock(&raw_v6_lock); if ((sk = sk_head(&raw_v6_htable[hash])) != NULL) { - while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr))) { + while((sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, + IP6CB(skb)->iif))) { rawv6_err(sk, skb, NULL, type, code, inner_offset, info); sk = sk_next(sk); } @@ -557,7 +587,7 @@ static void icmpv6_notify(struct sk_buff *skb, int type, int code, u32 info) * Handle icmp messages */ -static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) +static int icmpv6_rcv(struct sk_buff **pskb) { struct sk_buff *skb = *pskb; struct net_device *dev = skb->dev; @@ -573,21 +603,18 @@ static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) daddr = &skb->nh.ipv6h->daddr; /* Perform checksum. */ - if (skb->ip_summed == CHECKSUM_HW) { - skb->ip_summed = CHECKSUM_UNNECESSARY; - if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, - skb->csum)) { - LIMIT_NETDEBUG( - printk(KERN_DEBUG "ICMPv6 hw checksum failed\n")); - skb->ip_summed = CHECKSUM_NONE; - } - } - if (skb->ip_summed == CHECKSUM_NONE) { - if (csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, - skb_checksum(skb, 0, skb->len, 0))) { - LIMIT_NETDEBUG( - printk(KERN_DEBUG "ICMPv6 checksum failed [%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x > %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x]\n", - NIP6(*saddr), NIP6(*daddr))); + switch (skb->ip_summed) { + case CHECKSUM_HW: + if (!csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_ICMPV6, + skb->csum)) + break; + /* fall through */ + case CHECKSUM_NONE: + skb->csum = ~csum_ipv6_magic(saddr, daddr, skb->len, + IPPROTO_ICMPV6, 0); + if (__skb_checksum_complete(skb)) { + LIMIT_NETDEBUG(KERN_DEBUG "ICMPv6 checksum failed [" NIP6_FMT " > " NIP6_FMT "]\n", + NIP6(*saddr), NIP6(*daddr)); goto discard_it; } } @@ -663,8 +690,7 @@ static int icmpv6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) break; default: - LIMIT_NETDEBUG( - printk(KERN_DEBUG "icmpv6: msg of unknown type\n")); + LIMIT_NETDEBUG(KERN_DEBUG "icmpv6: msg of unknown type\n"); /* informational */ if (type & ICMPV6_INFOMSG_MASK) @@ -691,10 +717,7 @@ int __init icmpv6_init(struct net_proto_family *ops) struct sock *sk; int err, i, j; - for (i = 0; i < NR_CPUS; i++) { - if (!cpu_possible(i)) - continue; - + for_each_possible_cpu(i) { err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &per_cpu(__icmpv6_socket, i)); if (err < 0) { @@ -740,15 +763,13 @@ void icmpv6_cleanup(void) { int i; - for (i = 0; i < NR_CPUS; i++) { - if (!cpu_possible(i)) - continue; + for_each_possible_cpu(i) { sock_release(per_cpu(__icmpv6_socket, i)); } inet6_del_protocol(&icmpv6_protocol, IPPROTO_ICMPV6); } -static struct icmp6_err { +static const struct icmp6_err { int err; int fatal; } tab_unreach[] = {