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netfilter: kill nf_send_reset6() from include/net/netfilter/ipv6/nf_reject.h
nf_send_reset6() now resides in net/ipv6/netfilter/nf_reject_ipv6.c
Fixes: c8d7b98 ("netfilter: move nf_send_resetX() code to nf_reject_ipvX modules")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Acked-by: Eric Dumazet <edumazet@google.com>
This commit is contained in:
Pablo Neira Ayuso
parent
4e62ccd901
commit
91c1a09b33
@ -1,11 +1,7 @@
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#ifndef _IPV6_NF_REJECT_H
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#define _IPV6_NF_REJECT_H
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <net/ip6_fib.h>
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#include <net/ip6_checksum.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/icmpv6.h>
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static inline void
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nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
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@ -17,155 +13,6 @@ nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
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icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0);
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}
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/* Send RST reply */
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static void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
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{
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struct sk_buff *nskb;
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struct tcphdr otcph, *tcph;
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unsigned int otcplen, hh_len;
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int tcphoff, needs_ack;
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const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
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struct ipv6hdr *ip6h;
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#define DEFAULT_TOS_VALUE 0x0U
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const __u8 tclass = DEFAULT_TOS_VALUE;
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struct dst_entry *dst = NULL;
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u8 proto;
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__be16 frag_off;
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struct flowi6 fl6;
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if ((!(ipv6_addr_type(&oip6h->saddr) & IPV6_ADDR_UNICAST)) ||
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(!(ipv6_addr_type(&oip6h->daddr) & IPV6_ADDR_UNICAST))) {
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pr_debug("addr is not unicast.\n");
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return;
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}
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proto = oip6h->nexthdr;
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tcphoff = ipv6_skip_exthdr(oldskb, ((u8*)(oip6h+1) - oldskb->data), &proto, &frag_off);
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if ((tcphoff < 0) || (tcphoff > oldskb->len)) {
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pr_debug("Cannot get TCP header.\n");
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return;
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}
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otcplen = oldskb->len - tcphoff;
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/* IP header checks: fragment, too short. */
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if (proto != IPPROTO_TCP || otcplen < sizeof(struct tcphdr)) {
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pr_debug("proto(%d) != IPPROTO_TCP, "
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"or too short. otcplen = %d\n",
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proto, otcplen);
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return;
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}
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if (skb_copy_bits(oldskb, tcphoff, &otcph, sizeof(struct tcphdr)))
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BUG();
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/* No RST for RST. */
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if (otcph.rst) {
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pr_debug("RST is set\n");
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return;
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}
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/* Check checksum. */
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if (nf_ip6_checksum(oldskb, hook, tcphoff, IPPROTO_TCP)) {
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pr_debug("TCP checksum is invalid\n");
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return;
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}
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memset(&fl6, 0, sizeof(fl6));
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fl6.flowi6_proto = IPPROTO_TCP;
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fl6.saddr = oip6h->daddr;
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fl6.daddr = oip6h->saddr;
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fl6.fl6_sport = otcph.dest;
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fl6.fl6_dport = otcph.source;
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security_skb_classify_flow(oldskb, flowi6_to_flowi(&fl6));
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dst = ip6_route_output(net, NULL, &fl6);
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if (dst == NULL || dst->error) {
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dst_release(dst);
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return;
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}
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dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
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if (IS_ERR(dst))
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return;
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hh_len = (dst->dev->hard_header_len + 15)&~15;
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nskb = alloc_skb(hh_len + 15 + dst->header_len + sizeof(struct ipv6hdr)
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+ sizeof(struct tcphdr) + dst->trailer_len,
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GFP_ATOMIC);
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if (!nskb) {
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net_dbg_ratelimited("cannot alloc skb\n");
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dst_release(dst);
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return;
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}
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skb_dst_set(nskb, dst);
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skb_reserve(nskb, hh_len + dst->header_len);
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skb_put(nskb, sizeof(struct ipv6hdr));
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skb_reset_network_header(nskb);
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ip6h = ipv6_hdr(nskb);
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ip6_flow_hdr(ip6h, tclass, 0);
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ip6h->hop_limit = ip6_dst_hoplimit(dst);
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ip6h->nexthdr = IPPROTO_TCP;
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ip6h->saddr = oip6h->daddr;
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ip6h->daddr = oip6h->saddr;
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skb_reset_transport_header(nskb);
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tcph = (struct tcphdr *)skb_put(nskb, sizeof(struct tcphdr));
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/* Truncate to length (no data) */
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tcph->doff = sizeof(struct tcphdr)/4;
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tcph->source = otcph.dest;
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tcph->dest = otcph.source;
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if (otcph.ack) {
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needs_ack = 0;
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tcph->seq = otcph.ack_seq;
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tcph->ack_seq = 0;
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} else {
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needs_ack = 1;
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tcph->ack_seq = htonl(ntohl(otcph.seq) + otcph.syn + otcph.fin
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+ otcplen - (otcph.doff<<2));
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tcph->seq = 0;
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}
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/* Reset flags */
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((u_int8_t *)tcph)[13] = 0;
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tcph->rst = 1;
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tcph->ack = needs_ack;
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tcph->window = 0;
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tcph->urg_ptr = 0;
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tcph->check = 0;
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/* Adjust TCP checksum */
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tcph->check = csum_ipv6_magic(&ipv6_hdr(nskb)->saddr,
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&ipv6_hdr(nskb)->daddr,
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sizeof(struct tcphdr), IPPROTO_TCP,
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csum_partial(tcph,
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sizeof(struct tcphdr), 0));
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nf_ct_attach(nskb, oldskb);
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#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
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/* If we use ip6_local_out for bridged traffic, the MAC source on
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* the RST will be ours, instead of the destination's. This confuses
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* some routers/firewalls, and they drop the packet. So we need to
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* build the eth header using the original destination's MAC as the
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* source, and send the RST packet directly.
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*/
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if (oldskb->nf_bridge) {
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struct ethhdr *oeth = eth_hdr(oldskb);
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nskb->dev = oldskb->nf_bridge->physindev;
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nskb->protocol = htons(ETH_P_IPV6);
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ip6h->payload_len = htons(sizeof(struct tcphdr));
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if (dev_hard_header(nskb, nskb->dev, ntohs(nskb->protocol),
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oeth->h_source, oeth->h_dest, nskb->len) < 0)
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return;
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dev_queue_xmit(nskb);
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} else
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#endif
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ip6_local_out(nskb);
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}
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void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook);
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#endif /* _IPV6_NF_REJECT_H */
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