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sctp: support for sending packet over udp6 sock

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This one basically does the similar things in sctp_v6_xmit as does for
udp4 sock in the last patch, just note that:

  1. label needs to be calculated, as it's the param of
     udp_tunnel6_xmit_skb().

  2. The 'nocheck' param of udp_tunnel6_xmit_skb() is false, as
     required by RFC.

v1->v2:
  - Use sp->udp_port instead in sctp_v6_xmit(), which is more safe.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xin Long 2020-10-29 15:05:07 +08:00 committed by Jakub Kicinski
parent 600af7fd80
commit 259db53ba5
1 changed files with 32 additions and 11 deletions
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43
net/sctp/ipv6.c
View file

@ -55,6 +55,7 @@
#include <net/inet_common.h>
#include <net/inet_ecn.h>
#include <net/sctp/sctp.h>
#include <net/udp_tunnel.h>
#include <linux/uaccess.h>
@ -191,33 +192,53 @@ static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
return ret;
}
static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t)
{
struct dst_entry *dst = dst_clone(t->dst);
struct flowi6 *fl6 = &t->fl.u.ip6;
struct sock *sk = skb->sk;
struct ipv6_pinfo *np = inet6_sk(sk);
struct flowi6 *fl6 = &transport->fl.u.ip6;
__u8 tclass = np->tclass;
int res;
__be32 label;
pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
skb->len, &fl6->saddr, &fl6->daddr);
if (transport->dscp & SCTP_DSCP_SET_MASK)
tclass = transport->dscp & SCTP_DSCP_VAL_MASK;
if (t->dscp & SCTP_DSCP_SET_MASK)
tclass = t->dscp & SCTP_DSCP_VAL_MASK;
if (INET_ECN_is_capable(tclass))
IP6_ECN_flow_xmit(sk, fl6->flowlabel);
if (!(transport->param_flags & SPP_PMTUD_ENABLE))
if (!(t->param_flags & SPP_PMTUD_ENABLE))
skb->ignore_df = 1;
SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
rcu_read_lock();
res = ip6_xmit(sk, skb, fl6, sk->sk_mark, rcu_dereference(np->opt),
tclass, sk->sk_priority);
rcu_read_unlock();
return res;
if (!t->encap_port || !sctp_sk(sk)->udp_port) {
int res;
skb_dst_set(skb, dst);
rcu_read_lock();
res = ip6_xmit(sk, skb, fl6, sk->sk_mark,
rcu_dereference(np->opt),
tclass, sk->sk_priority);
rcu_read_unlock();
return res;
}
if (skb_is_gso(skb))
skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
skb->encapsulation = 1;
skb_reset_inner_mac_header(skb);
skb_reset_inner_transport_header(skb);
skb_set_inner_ipproto(skb, IPPROTO_SCTP);
label = ip6_make_flowlabel(sock_net(sk), skb, fl6->flowlabel, true, fl6);
return udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr,
&fl6->daddr, tclass, ip6_dst_hoplimit(dst),
label, sctp_sk(sk)->udp_port, t->encap_port, false);
}
/* Returns the dst cache entry for the given source and destination ip