From fbbc5bc2ab8c525f4aba4346249e3adc52d8e2c0 Mon Sep 17 00:00:00 2001 From: Julien Massonneau Date: Thu, 11 Mar 2021 16:53:19 +0100 Subject: [PATCH] seg6: ignore routing header with segments left equal to 0 When there are 2 segments routing header, after an End.B6 action for example, the second SRH will never be handled by an action, packet will be dropped when the first SRH has segments left equal to 0. For actions that doesn't perform decapsulation (currently: End, End.X, End.T, End.B6, End.B6.Encaps), this patch adds the IP6_FH_F_SKIP_RH flag in arguments for ipv6_find_hdr(). Signed-off-by: Julien Massonneau Signed-off-by: David S. Miller --- net/ipv6/seg6_local.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/net/ipv6/seg6_local.c b/net/ipv6/seg6_local.c index c2a0c78e84d4..8936f48570fc 100644 --- a/net/ipv6/seg6_local.c +++ b/net/ipv6/seg6_local.c @@ -119,12 +119,12 @@ static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt) return (struct seg6_local_lwt *)lwt->data; } -static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb) +static struct ipv6_sr_hdr *get_srh(struct sk_buff *skb, int flags) { struct ipv6_sr_hdr *srh; int len, srhoff = 0; - if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) + if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, &flags) < 0) return NULL; if (!pskb_may_pull(skb, srhoff + sizeof(*srh))) @@ -152,13 +152,10 @@ static struct ipv6_sr_hdr *get_and_validate_srh(struct sk_buff *skb) { struct ipv6_sr_hdr *srh; - srh = get_srh(skb); + srh = get_srh(skb, IP6_FH_F_SKIP_RH); if (!srh) return NULL; - if (srh->segments_left == 0) - return NULL; - #ifdef CONFIG_IPV6_SEG6_HMAC if (!seg6_hmac_validate_skb(skb)) return NULL; @@ -172,7 +169,7 @@ static bool decap_and_validate(struct sk_buff *skb, int proto) struct ipv6_sr_hdr *srh; unsigned int off = 0; - srh = get_srh(skb); + srh = get_srh(skb, 0); if (srh && srh->segments_left > 0) return false; -- 2.20.1