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sctp: process sctp over udp icmp err on sctp side

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Previously, sctp over udp was using udp tunnel's icmp err process, which
only does sk lookup on sctp side. However for sctp's icmp error process,
there are more things to do, like syncing assoc pmtu/retransmit packets
for toobig type err, and starting proto_unreach_timer for unreach type
err etc.

Now after adding PLPMTUD, which also requires to process toobig type err
on sctp side. This patch is to process icmp err on sctp side by parsing
the type/code/info in .encap_err_lookup and call sctp's icmp processing
functions. Note as the 'redirect' err process needs to know the outer
ip(v6) header's, we have to leave it to udp(v6)_err to handle it.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2021-06-22 14:05:00 -04:00
committed by David S. Miller
parent d83060759a
commit 9e47df005c
4 changed files with 64 additions and 19 deletions
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30
net/sctp/ipv6.c
View File

@@ -188,6 +188,36 @@ static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
return 0;
}
int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb)
{
struct net *net = dev_net(skb->dev);
struct sctp_association *asoc;
struct sctp_transport *t;
struct icmp6hdr *hdr;
__u32 info = 0;
skb->transport_header += sizeof(struct udphdr);
sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &t);
if (!sk) {
__ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
return -ENOENT;
}
skb->transport_header -= sizeof(struct udphdr);
hdr = (struct icmp6hdr *)(skb_network_header(skb) - sizeof(struct icmp6hdr));
if (hdr->icmp6_type == NDISC_REDIRECT) {
/* can't be handled without outer ip6hdr known, leave it to udpv6_err */
sctp_err_finish(sk, t);
return 0;
}
if (hdr->icmp6_type == ICMPV6_PKT_TOOBIG)
info = ntohl(hdr->icmp6_mtu);
sctp_v6_err_handle(t, skb, hdr->icmp6_type, hdr->icmp6_code, info);
sctp_err_finish(sk, t);
return 1;
}
static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t)
{
struct dst_entry *dst = dst_clone(t->dst);