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esp6: calculate transport_header correctly when sel.family != AF_INET6 

In esp6_init_state() for beet mode when x->sel.family != AF_INET6:

  x->props.header_len = sizeof(struct ip_esp_hdr) +
     crypto_aead_ivsize(aead) + IPV4_BEET_PHMAXLEN +
     (sizeof(struct ipv6hdr) - sizeof(struct iphdr))

In xfrm6_beet_gso_segment() skb->transport_header is supposed to move
to the end of the ph header for IPPROTO_BEETPH, so if x->sel.family !=
AF_INET6 and it's IPPROTO_BEETPH, it should do:

   skb->transport_header -=
      (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
   skb->transport_header += ph->hdrlen * 8;

And IPV4_BEET_PHMAXLEN is only reserved for PH header, so if
x->sel.family != AF_INET6 and it's not IPPROTO_BEETPH, it should do:

   skb->transport_header -=
      (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
   skb->transport_header -= IPV4_BEET_PHMAXLEN;

Thanks Sabrina for looking deep into this issue.

Fixes: 7f9e40eb18 ("esp6: add gso_segment for esp6 beet mode")
Reported-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Xin Long 2020-05-13 18:38:54 +08:00 committed by Steffen Klassert
parent c95c5f58b3
commit 56b1b7c667
1 changed files with 15 additions and 12 deletions
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27
net/ipv6/esp6_offload.c
View File

@ -175,24 +175,27 @@ static struct sk_buff *xfrm6_beet_gso_segment(struct xfrm_state *x,
skb->transport_header += x->props.header_len;
if (proto == IPPROTO_BEETPH) {
struct ip_beet_phdr *ph = (struct ip_beet_phdr *)skb->data;
if (x->sel.family != AF_INET6) {
skb->transport_header -=
(sizeof(struct ipv6hdr) - sizeof(struct iphdr));
skb->transport_header += ph->hdrlen * 8;
proto = ph->nexthdr;
}
if (proto == IPPROTO_BEETPH) {
struct ip_beet_phdr *ph =
(struct ip_beet_phdr *)skb->data;
if (x->sel.family == AF_INET6) {
skb->transport_header += ph->hdrlen * 8;
proto = ph->nexthdr;
} else {
skb->transport_header -= IPV4_BEET_PHMAXLEN;
}
if (proto == IPPROTO_TCP)
skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
} else {
__be16 frag;
skb->transport_header +=
ipv6_skip_exthdr(skb, 0, &proto, &frag);
} else {
skb->transport_header -=
(sizeof(struct ipv6hdr) - sizeof(struct iphdr));
if (proto == IPPROTO_TCP)
skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV6;
}
__skb_pull(skb, skb_transport_offset(skb));