[patch RFC net-next v2 3/3] udp6: Use Segment Routing Header for dest address if present
flat view
STALE1781d
SUPERSEDED
From: Andrew Lunn <andrew@lunn.ch>
Date: 2021-12-01 20:25:46
Subsystem:
networking [general], the rest, user datagram protocol (udp) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Willem de Bruijn
Revision v2 of 4 in this series.
Revisions (4)
- rfc [diff vs current]
- v2 current
- v4 [diff vs current]
- v5 [diff vs current]
When finding the socket to report an error on, if the invoking packet is using Segment Routing, the IPv6 destination address is that of an intermediate router, not the end destination. Extract the ultimate destination address from the segment address. This change allows traceroute to function in the presence of Segment Routing. Signed-off-by: Andrew Lunn <andrew@lunn.ch> --- net/ipv6/udp.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 6a0e569f0bb8..6a2288e7ddda 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c@@ -40,6 +40,7 @@ #include <net/transp_v6.h> #include <net/ip6_route.h> #include <net/raw.h> +#include <net/seg6.h> #include <net/tcp_states.h> #include <net/ip6_checksum.h> #include <net/ip6_tunnel.h>
@@ -563,12 +564,18 @@ int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, const struct in6_addr *saddr = &hdr->saddr; const struct in6_addr *daddr = &hdr->daddr; struct udphdr *uh = (struct udphdr *)(skb->data+offset); + struct ipv6_sr_hdr *srh; bool tunnel = false; struct sock *sk; int harderr; int err; struct net *net = dev_net(skb->dev); + if (opt->flags & IP6SKB_SEG6) { + srh = (struct ipv6_sr_hdr *)(skb->data + opt->srhoff); + daddr = &srh->segments[0]; + } + sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, inet6_iif(skb), inet6_sdif(skb), udptable, NULL);
--
2.33.1