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>

diff --git a/include/net/netfilter/ipv6/nf_reject.h b/include/net/netfilter/ipv6/nf_reject.h
index 7a10cfcd8e33fd73e47e14877f31b1d5baf65b1f..48e18810a9be6fcc6250f80db0d8febcf4e3cdf4 100644 (file)
--- a/include/net/netfilter/ipv6/nf_reject.h
+++ b/include/net/netfilter/ipv6/nf_reject.h
@@ -1,11 +1,7 @@
 #ifndef _IPV6_NF_REJECT_H
 #define _IPV6_NF_REJECT_H
 
-#include <net/ipv6.h>
-#include <net/ip6_route.h>
-#include <net/ip6_fib.h>
-#include <net/ip6_checksum.h>
-#include <linux/netfilter_ipv6.h>
+#include <linux/icmpv6.h>
 
 static inline void
 nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
@@ -17,155 +13,6 @@ nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
        icmpv6_send(skb_in, ICMPV6_DEST_UNREACH, code, 0);
 }
 
-/* Send RST reply */
-static void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
-{
-       struct sk_buff *nskb;
-       struct tcphdr otcph, *tcph;
-       unsigned int otcplen, hh_len;
-       int tcphoff, needs_ack;
-       const struct ipv6hdr *oip6h = ipv6_hdr(oldskb);
-       struct ipv6hdr *ip6h;
-#define DEFAULT_TOS_VALUE      0x0U
-       const __u8 tclass = DEFAULT_TOS_VALUE;
-       struct dst_entry *dst = NULL;
-       u8 proto;
-       __be16 frag_off;
-       struct flowi6 fl6;
-
-       if ((!(ipv6_addr_type(&oip6h->saddr) & IPV6_ADDR_UNICAST)) ||
-           (!(ipv6_addr_type(&oip6h->daddr) & IPV6_ADDR_UNICAST))) {
-               pr_debug("addr is not unicast.\n");
-               return;
-       }
-
-       proto = oip6h->nexthdr;
-       tcphoff = ipv6_skip_exthdr(oldskb, ((u8*)(oip6h+1) - oldskb->data), &proto, &frag_off);
-
-       if ((tcphoff < 0) || (tcphoff > oldskb->len)) {
-               pr_debug("Cannot get TCP header.\n");
-               return;
-       }
-
-       otcplen = oldskb->len - tcphoff;
-
-       /* IP header checks: fragment, too short. */
-       if (proto != IPPROTO_TCP || otcplen < sizeof(struct tcphdr)) {
-               pr_debug("proto(%d) != IPPROTO_TCP, "
-                        "or too short. otcplen = %d\n",
-                        proto, otcplen);
-               return;
-       }
-
-       if (skb_copy_bits(oldskb, tcphoff, &otcph, sizeof(struct tcphdr)))
-               BUG();
-
-       /* No RST for RST. */
-       if (otcph.rst) {
-               pr_debug("RST is set\n");
-               return;
-       }
-
-       /* Check checksum. */
-       if (nf_ip6_checksum(oldskb, hook, tcphoff, IPPROTO_TCP)) {
-               pr_debug("TCP checksum is invalid\n");
-               return;
-       }
-
-       memset(&fl6, 0, sizeof(fl6));
-       fl6.flowi6_proto = IPPROTO_TCP;
-       fl6.saddr = oip6h->daddr;
-       fl6.daddr = oip6h->saddr;
-       fl6.fl6_sport = otcph.dest;
-       fl6.fl6_dport = otcph.source;
-       security_skb_classify_flow(oldskb, flowi6_to_flowi(&fl6));
-       dst = ip6_route_output(net, NULL, &fl6);
-       if (dst == NULL || dst->error) {
-               dst_release(dst);
-               return;
-       }
-       dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
-       if (IS_ERR(dst))
-               return;
-
-       hh_len = (dst->dev->hard_header_len + 15)&~15;
-       nskb = alloc_skb(hh_len + 15 + dst->header_len + sizeof(struct ipv6hdr)
-                        + sizeof(struct tcphdr) + dst->trailer_len,
-                        GFP_ATOMIC);
-
-       if (!nskb) {
-               net_dbg_ratelimited("cannot alloc skb\n");
-               dst_release(dst);
-               return;
-       }
-
-       skb_dst_set(nskb, dst);
-
-       skb_reserve(nskb, hh_len + dst->header_len);
-
-       skb_put(nskb, sizeof(struct ipv6hdr));
-       skb_reset_network_header(nskb);
-       ip6h = ipv6_hdr(nskb);
-       ip6_flow_hdr(ip6h, tclass, 0);
-       ip6h->hop_limit = ip6_dst_hoplimit(dst);
-       ip6h->nexthdr = IPPROTO_TCP;
-       ip6h->saddr = oip6h->daddr;
-       ip6h->daddr = oip6h->saddr;
-
-       skb_reset_transport_header(nskb);
-       tcph = (struct tcphdr *)skb_put(nskb, sizeof(struct tcphdr));
-       /* Truncate to length (no data) */
-       tcph->doff = sizeof(struct tcphdr)/4;
-       tcph->source = otcph.dest;
-       tcph->dest = otcph.source;
-
-       if (otcph.ack) {
-               needs_ack = 0;
-               tcph->seq = otcph.ack_seq;
-               tcph->ack_seq = 0;
-       } else {
-               needs_ack = 1;
-               tcph->ack_seq = htonl(ntohl(otcph.seq) + otcph.syn + otcph.fin
-                                     + otcplen - (otcph.doff<<2));
-               tcph->seq = 0;
-       }
-
-       /* Reset flags */
-       ((u_int8_t *)tcph)[13] = 0;
-       tcph->rst = 1;
-       tcph->ack = needs_ack;
-       tcph->window = 0;
-       tcph->urg_ptr = 0;
-       tcph->check = 0;
-
-       /* Adjust TCP checksum */
-       tcph->check = csum_ipv6_magic(&ipv6_hdr(nskb)->saddr,
-                                     &ipv6_hdr(nskb)->daddr,
-                                     sizeof(struct tcphdr), IPPROTO_TCP,
-                                     csum_partial(tcph,
-                                                  sizeof(struct tcphdr), 0));
-
-       nf_ct_attach(nskb, oldskb);
-
-#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
-       /* If we use ip6_local_out for bridged traffic, the MAC source on
-        * the RST will be ours, instead of the destination's.  This confuses
-        * some routers/firewalls, and they drop the packet.  So we need to
-        * build the eth header using the original destination's MAC as the
-        * source, and send the RST packet directly.
-        */
-       if (oldskb->nf_bridge) {
-               struct ethhdr *oeth = eth_hdr(oldskb);
-               nskb->dev = oldskb->nf_bridge->physindev;
-               nskb->protocol = htons(ETH_P_IPV6);
-               ip6h->payload_len = htons(sizeof(struct tcphdr));
-               if (dev_hard_header(nskb, nskb->dev, ntohs(nskb->protocol),
-                                   oeth->h_source, oeth->h_dest, nskb->len) < 0)
-                       return;
-               dev_queue_xmit(nskb);
-       } else
-#endif
-               ip6_local_out(nskb);
-}
+void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook);
 
 #endif /* _IPV6_NF_REJECT_H */