From 73348fed35d023e998cbd303a28400f2c0ec30a3 Mon Sep 17 00:00:00 2001 From: Haishuang Yan Date: Sun, 15 Mar 2020 21:25:41 +0800 Subject: [PATCH] ipvs: optimize tunnel dumps for icmp errors After strip GRE/UDP tunnel header for icmp errors, it's better to show "GRE/UDP" instead of "IPIP" in debug message. Signed-off-by: Haishuang Yan Acked-by: Julian Anastasov Signed-off-by: Pablo Neira Ayuso --- net/netfilter/ipvs/ip_vs_core.c | 46 +++++++++++++++++++++++------------------ 1 file changed, 26 insertions(+), 20 deletions(-) diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c index 512259f..d2ac530 100644 --- a/net/netfilter/ipvs/ip_vs_core.c +++ b/net/netfilter/ipvs/ip_vs_core.c @@ -1661,8 +1661,9 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, struct ip_vs_protocol *pp; struct ip_vs_proto_data *pd; unsigned int offset, offset2, ihl, verdict; - bool ipip, new_cp = false; + bool tunnel, new_cp = false; union nf_inet_addr *raddr; + char *outer_proto; *related = 1; @@ -1703,8 +1704,8 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, return NF_ACCEPT; /* The packet looks wrong, ignore */ raddr = (union nf_inet_addr *)&cih->daddr; - /* Special case for errors for IPIP packets */ - ipip = false; + /* Special case for errors for IPIP/UDP/GRE tunnel packets */ + tunnel = false; if (cih->protocol == IPPROTO_IPIP) { struct ip_vs_dest *dest; @@ -1721,7 +1722,8 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph); if (cih == NULL) return NF_ACCEPT; /* The packet looks wrong, ignore */ - ipip = true; + tunnel = true; + outer_proto = "IPIP"; } else if ((cih->protocol == IPPROTO_UDP || /* Can be UDP encap */ cih->protocol == IPPROTO_GRE) && /* Can be GRE encap */ /* Error for our tunnel must arrive at LOCAL_IN */ @@ -1729,16 +1731,19 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, __u8 iproto; int ulen; - /* Non-first fragment has no UDP header */ + /* Non-first fragment has no UDP/GRE header */ if (unlikely(cih->frag_off & htons(IP_OFFSET))) return NF_ACCEPT; offset2 = offset + cih->ihl * 4; - if (cih->protocol == IPPROTO_UDP) + if (cih->protocol == IPPROTO_UDP) { ulen = ipvs_udp_decap(ipvs, skb, offset2, AF_INET, raddr, &iproto); - else + outer_proto = "UDP"; + } else { ulen = ipvs_gre_decap(ipvs, skb, offset2, AF_INET, raddr, &iproto); + outer_proto = "GRE"; + } if (ulen > 0) { /* Skip IP and UDP/GRE tunnel headers */ offset = offset2 + ulen; @@ -1747,7 +1752,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, &_ciph); if (cih && cih->version == 4 && cih->ihl >= 5 && iproto == IPPROTO_IPIP) - ipip = true; + tunnel = true; else return NF_ACCEPT; } @@ -1767,11 +1772,11 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, "Checking incoming ICMP for"); offset2 = offset; - ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, !ipip, &ciph); + ip_vs_fill_iph_skb_icmp(AF_INET, skb, offset, !tunnel, &ciph); offset = ciph.len; /* The embedded headers contain source and dest in reverse order. - * For IPIP this is error for request, not for reply. + * For IPIP/UDP/GRE tunnel this is error for request, not for reply. */ cp = INDIRECT_CALL_1(pp->conn_in_get, ip_vs_conn_in_get_proto, ipvs, AF_INET, skb, &ciph); @@ -1779,7 +1784,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, if (!cp) { int v; - if (ipip || !sysctl_schedule_icmp(ipvs)) + if (tunnel || !sysctl_schedule_icmp(ipvs)) return NF_ACCEPT; if (!ip_vs_try_to_schedule(ipvs, AF_INET, skb, pd, &v, &cp, &ciph)) @@ -1797,7 +1802,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, goto out; } - if (ipip) { + if (tunnel) { __be32 info = ic->un.gateway; __u8 type = ic->type; __u8 code = ic->code; @@ -1809,17 +1814,18 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, u32 mtu = ntohs(ic->un.frag.mtu); __be16 frag_off = cih->frag_off; - /* Strip outer IP and ICMP, go to IPIP header */ + /* Strip outer IP and ICMP, go to IPIP/UDP/GRE header */ if (pskb_pull(skb, ihl + sizeof(_icmph)) == NULL) - goto ignore_ipip; + goto ignore_tunnel; offset2 -= ihl + sizeof(_icmph); skb_reset_network_header(skb); - IP_VS_DBG(12, "ICMP for IPIP %pI4->%pI4: mtu=%u\n", - &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, mtu); + IP_VS_DBG(12, "ICMP for %s %pI4->%pI4: mtu=%u\n", + outer_proto, &ip_hdr(skb)->saddr, + &ip_hdr(skb)->daddr, mtu); ipv4_update_pmtu(skb, ipvs->net, mtu, 0, 0); /* Client uses PMTUD? */ if (!(frag_off & htons(IP_DF))) - goto ignore_ipip; + goto ignore_tunnel; /* Prefer the resulting PMTU */ if (dest) { struct ip_vs_dest_dst *dest_dst; @@ -1832,11 +1838,11 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, mtu -= sizeof(struct iphdr); info = htonl(mtu); } - /* Strip outer IP, ICMP and IPIP, go to IP header of + /* Strip outer IP, ICMP and IPIP/UDP/GRE, go to IP header of * original request. */ if (pskb_pull(skb, offset2) == NULL) - goto ignore_ipip; + goto ignore_tunnel; skb_reset_network_header(skb); IP_VS_DBG(12, "Sending ICMP for %pI4->%pI4: t=%u, c=%u, i=%u\n", &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, @@ -1845,7 +1851,7 @@ ip_vs_in_icmp(struct netns_ipvs *ipvs, struct sk_buff *skb, int *related, /* ICMP can be shorter but anyways, account it */ ip_vs_out_stats(cp, skb); -ignore_ipip: +ignore_tunnel: consume_skb(skb); verdict = NF_STOLEN; goto out; -- 2.7.4