X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=net%2Fipv6%2Fnetfilter%2Fnf_conntrack_proto_icmpv6.c;h=0f3df45718ac9198692ea40cbbe0ca2e56468754;hb=3666ed1c4837fd6906da0224c5373d7a2186a193;hp=44689d4444104849774cb0ea2c4cb76b34b4d8dc;hpb=77236b6e33b06aaf756a86ed1965ca7d460b1b53;p=safe%2Fjmp%2Flinux-2.6 diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c index 44689d4..0f3df45 100644 --- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c +++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c @@ -24,44 +24,57 @@ #include #include #include +#include -static unsigned long nf_ct_icmpv6_timeout __read_mostly = 30*HZ; +static unsigned int nf_ct_icmpv6_timeout __read_mostly = 30*HZ; -static int icmpv6_pkt_to_tuple(const struct sk_buff *skb, - unsigned int dataoff, - struct nf_conntrack_tuple *tuple) +static bool icmpv6_pkt_to_tuple(const struct sk_buff *skb, + unsigned int dataoff, + struct nf_conntrack_tuple *tuple) { - struct icmp6hdr _hdr, *hp; + const struct icmp6hdr *hp; + struct icmp6hdr _hdr; hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr); if (hp == NULL) - return 0; + return false; tuple->dst.u.icmp.type = hp->icmp6_type; tuple->src.u.icmp.id = hp->icmp6_identifier; tuple->dst.u.icmp.code = hp->icmp6_code; - return 1; + return true; } /* Add 1; spaces filled with 0. */ -static u_int8_t invmap[] = { +static const u_int8_t invmap[] = { [ICMPV6_ECHO_REQUEST - 128] = ICMPV6_ECHO_REPLY + 1, [ICMPV6_ECHO_REPLY - 128] = ICMPV6_ECHO_REQUEST + 1, - [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_QUERY + 1, - [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_REPLY +1 + [ICMPV6_NI_QUERY - 128] = ICMPV6_NI_REPLY + 1, + [ICMPV6_NI_REPLY - 128] = ICMPV6_NI_QUERY +1 +}; + +static const u_int8_t noct_valid_new[] = { + [ICMPV6_MGM_QUERY - 130] = 1, + [ICMPV6_MGM_REPORT -130] = 1, + [ICMPV6_MGM_REDUCTION - 130] = 1, + [NDISC_ROUTER_SOLICITATION - 130] = 1, + [NDISC_ROUTER_ADVERTISEMENT - 130] = 1, + [NDISC_NEIGHBOUR_SOLICITATION - 130] = 1, + [NDISC_NEIGHBOUR_ADVERTISEMENT - 130] = 1, + [ICMPV6_MLD2_REPORT - 130] = 1 }; -static int icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple, - const struct nf_conntrack_tuple *orig) +static bool icmpv6_invert_tuple(struct nf_conntrack_tuple *tuple, + const struct nf_conntrack_tuple *orig) { int type = orig->dst.u.icmp.type - 128; if (type < 0 || type >= sizeof(invmap) || !invmap[type]) - return 0; + return false; tuple->src.u.icmp.id = orig->src.u.icmp.id; tuple->dst.u.icmp.type = invmap[type] - 1; tuple->dst.u.icmp.code = orig->dst.u.icmp.code; - return 1; + return true; } /* Print out the per-protocol part of the tuple. */ @@ -74,69 +87,56 @@ static int icmpv6_print_tuple(struct seq_file *s, ntohs(tuple->src.u.icmp.id)); } -/* Print out the private part of the conntrack. */ -static int icmpv6_print_conntrack(struct seq_file *s, - const struct nf_conn *conntrack) -{ - return 0; -} - /* Returns verdict for packet, or -1 for invalid. */ static int icmpv6_packet(struct nf_conn *ct, const struct sk_buff *skb, unsigned int dataoff, enum ip_conntrack_info ctinfo, - int pf, + u_int8_t pf, unsigned int hooknum) { - /* Try to delete connection immediately after all replies: - won't actually vanish as we still have skb, and del_timer - means this will only run once even if count hits zero twice - (theoretically possible with SMP) */ - if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) { - if (atomic_dec_and_test(&ct->proto.icmp.count) - && del_timer(&ct->timeout)) - ct->timeout.function((unsigned long)ct); - } else { - atomic_inc(&ct->proto.icmp.count); - nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb); - nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout); - } + /* Do not immediately delete the connection after the first + successful reply to avoid excessive conntrackd traffic + and also to handle correctly ICMP echo reply duplicates. */ + nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_icmpv6_timeout); return NF_ACCEPT; } /* Called when a new connection for this protocol found. */ -static int icmpv6_new(struct nf_conn *conntrack, - const struct sk_buff *skb, - unsigned int dataoff) +static bool icmpv6_new(struct nf_conn *ct, const struct sk_buff *skb, + unsigned int dataoff) { - static u_int8_t valid_new[] = { + static const u_int8_t valid_new[] = { [ICMPV6_ECHO_REQUEST - 128] = 1, [ICMPV6_NI_QUERY - 128] = 1 }; - int type = conntrack->tuplehash[0].tuple.dst.u.icmp.type - 128; + int type = ct->tuplehash[0].tuple.dst.u.icmp.type - 128; if (type < 0 || type >= sizeof(valid_new) || !valid_new[type]) { /* Can't create a new ICMPv6 `conn' with this. */ pr_debug("icmpv6: can't create new conn with type %u\n", type + 128); - NF_CT_DUMP_TUPLE(&conntrack->tuplehash[0].tuple); - return 0; + nf_ct_dump_tuple_ipv6(&ct->tuplehash[0].tuple); + if (LOG_INVALID(nf_ct_net(ct), IPPROTO_ICMPV6)) + nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL, + "nf_ct_icmpv6: invalid new with type %d ", + type + 128); + return false; } - atomic_set(&conntrack->proto.icmp.count, 0); - return 1; + return true; } static int -icmpv6_error_message(struct sk_buff *skb, +icmpv6_error_message(struct net *net, + struct sk_buff *skb, unsigned int icmp6off, enum ip_conntrack_info *ctinfo, unsigned int hooknum) { struct nf_conntrack_tuple intuple, origtuple; - struct nf_conntrack_tuple_hash *h; - struct nf_conntrack_l4proto *inproto; + const struct nf_conntrack_tuple_hash *h; + const struct nf_conntrack_l4proto *inproto; NF_CT_ASSERT(skb->nfct == NULL); @@ -163,7 +163,7 @@ icmpv6_error_message(struct sk_buff *skb, *ctinfo = IP_CT_RELATED; - h = nf_conntrack_find_get(&intuple); + h = nf_conntrack_find_get(net, &intuple); if (!h) { pr_debug("icmpv6_error: no match\n"); return -NF_ACCEPT; @@ -179,31 +179,43 @@ icmpv6_error_message(struct sk_buff *skb, } static int -icmpv6_error(struct sk_buff *skb, unsigned int dataoff, - enum ip_conntrack_info *ctinfo, int pf, unsigned int hooknum) +icmpv6_error(struct net *net, struct sk_buff *skb, unsigned int dataoff, + enum ip_conntrack_info *ctinfo, u_int8_t pf, unsigned int hooknum) { - struct icmp6hdr _ih, *icmp6h; + const struct icmp6hdr *icmp6h; + struct icmp6hdr _ih; + int type; icmp6h = skb_header_pointer(skb, dataoff, sizeof(_ih), &_ih); if (icmp6h == NULL) { - if (LOG_INVALID(IPPROTO_ICMPV6)) + if (LOG_INVALID(net, IPPROTO_ICMPV6)) nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL, "nf_ct_icmpv6: short packet "); return -NF_ACCEPT; } - if (nf_conntrack_checksum && hooknum == NF_INET_PRE_ROUTING && + if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING && nf_ip6_checksum(skb, hooknum, dataoff, IPPROTO_ICMPV6)) { - nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL, - "nf_ct_icmpv6: ICMPv6 checksum failed\n"); + if (LOG_INVALID(net, IPPROTO_ICMPV6)) + nf_log_packet(PF_INET6, 0, skb, NULL, NULL, NULL, + "nf_ct_icmpv6: ICMPv6 checksum failed "); return -NF_ACCEPT; } + type = icmp6h->icmp6_type - 130; + if (type >= 0 && type < sizeof(noct_valid_new) && + noct_valid_new[type]) { + skb->nfct = &nf_conntrack_untracked.ct_general; + skb->nfctinfo = IP_CT_NEW; + nf_conntrack_get(skb->nfct); + return NF_ACCEPT; + } + /* is not error message ? */ if (icmp6h->icmp6_type >= 128) return NF_ACCEPT; - return icmpv6_error_message(skb, dataoff, ctinfo, hooknum); + return icmpv6_error_message(net, skb, dataoff, ctinfo, hooknum); } #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) @@ -232,22 +244,27 @@ static const struct nla_policy icmpv6_nla_policy[CTA_PROTO_MAX+1] = { static int icmpv6_nlattr_to_tuple(struct nlattr *tb[], struct nf_conntrack_tuple *tuple) { - if (!tb[CTA_PROTO_ICMPV6_TYPE] - || !tb[CTA_PROTO_ICMPV6_CODE] - || !tb[CTA_PROTO_ICMPV6_ID]) + if (!tb[CTA_PROTO_ICMPV6_TYPE] || + !tb[CTA_PROTO_ICMPV6_CODE] || + !tb[CTA_PROTO_ICMPV6_ID]) return -EINVAL; tuple->dst.u.icmp.type = nla_get_u8(tb[CTA_PROTO_ICMPV6_TYPE]); tuple->dst.u.icmp.code = nla_get_u8(tb[CTA_PROTO_ICMPV6_CODE]); tuple->src.u.icmp.id = nla_get_be16(tb[CTA_PROTO_ICMPV6_ID]); - if (tuple->dst.u.icmp.type < 128 - || tuple->dst.u.icmp.type - 128 >= sizeof(invmap) - || !invmap[tuple->dst.u.icmp.type - 128]) + if (tuple->dst.u.icmp.type < 128 || + tuple->dst.u.icmp.type - 128 >= sizeof(invmap) || + !invmap[tuple->dst.u.icmp.type - 128]) return -EINVAL; return 0; } + +static int icmpv6_nlattr_tuple_size(void) +{ + return nla_policy_len(icmpv6_nla_policy, CTA_PROTO_MAX + 1); +} #endif #ifdef CONFIG_SYSCTL @@ -258,7 +275,7 @@ static struct ctl_table icmpv6_sysctl_table[] = { .data = &nf_ct_icmpv6_timeout, .maxlen = sizeof(unsigned int), .mode = 0644, - .proc_handler = &proc_dointvec_jiffies, + .proc_handler = proc_dointvec_jiffies, }, { .ctl_name = 0 @@ -274,12 +291,12 @@ struct nf_conntrack_l4proto nf_conntrack_l4proto_icmpv6 __read_mostly = .pkt_to_tuple = icmpv6_pkt_to_tuple, .invert_tuple = icmpv6_invert_tuple, .print_tuple = icmpv6_print_tuple, - .print_conntrack = icmpv6_print_conntrack, .packet = icmpv6_packet, .new = icmpv6_new, .error = icmpv6_error, #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) .tuple_to_nlattr = icmpv6_tuple_to_nlattr, + .nlattr_tuple_size = icmpv6_nlattr_tuple_size, .nlattr_to_tuple = icmpv6_nlattr_to_tuple, .nla_policy = icmpv6_nla_policy, #endif