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udp: ipv4: manipulate network header of NATed UDP GRO fraglist 

UDP/IP header of UDP GROed frag_skbs are not updated even after NAT
forwarding. Only the header of head_skb from ip_finish_output_gso ->
skb_gso_segment is updated but following frag_skbs are not updated.

A call path skb_mac_gso_segment -> inet_gso_segment ->
udp4_ufo_fragment -> __udp_gso_segment -> __udp_gso_segment_list
does not try to update UDP/IP header of the segment list but copy
only the MAC header.

Update port, addr and check of each skb of the segment list in
__udp_gso_segment_list. It covers both SNAT and DNAT.

Fixes: 9fd1ff5d2a (udp: Support UDP fraglist GRO/GSO.)
Signed-off-by: Dongseok Yi <dseok.yi@samsung.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Link: https://lore.kernel.org/r/1611962007-80092-1-git-send-email-dseok.yi@samsung.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
master
Dongseok Yi 2021-01-30 08:13:27 +09:00 committed by Jakub Kicinski
parent 28e104d002
commit c3df39ac9b
3 changed files with 66 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/udp.h
View File

@ -178,7 +178,7 @@ struct sk_buff *udp_gro_receive(struct list_head *head, struct sk_buff *skb,
int udp_gro_complete(struct sk_buff *skb, int nhoff, udp_lookup_t lookup);
struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
netdev_features_t features);
netdev_features_t features, bool is_ipv6);
static inline struct udphdr *udp_gro_udphdr(struct sk_buff *skb)
{

69
net/ipv4/udp_offload.c
View File

@ -187,8 +187,67 @@ out_unlock:
}
EXPORT_SYMBOL(skb_udp_tunnel_segment);
static void __udpv4_gso_segment_csum(struct sk_buff *seg,
__be32 *oldip, __be32 *newip,
__be16 *oldport, __be16 *newport)
{
struct udphdr *uh;
struct iphdr *iph;
if (*oldip == *newip && *oldport == *newport)
return;
uh = udp_hdr(seg);
iph = ip_hdr(seg);
if (uh->check) {
inet_proto_csum_replace4(&uh->check, seg, *oldip, *newip,
true);
inet_proto_csum_replace2(&uh->check, seg, *oldport, *newport,
false);
if (!uh->check)
uh->check = CSUM_MANGLED_0;
}
*oldport = *newport;
csum_replace4(&iph->check, *oldip, *newip);
*oldip = *newip;
}
static struct sk_buff *__udpv4_gso_segment_list_csum(struct sk_buff *segs)
{
struct sk_buff *seg;
struct udphdr *uh, *uh2;
struct iphdr *iph, *iph2;
seg = segs;
uh = udp_hdr(seg);
iph = ip_hdr(seg);
if ((udp_hdr(seg)->dest == udp_hdr(seg->next)->dest) &&
(udp_hdr(seg)->source == udp_hdr(seg->next)->source) &&
(ip_hdr(seg)->daddr == ip_hdr(seg->next)->daddr) &&
(ip_hdr(seg)->saddr == ip_hdr(seg->next)->saddr))
return segs;
while ((seg = seg->next)) {
uh2 = udp_hdr(seg);
iph2 = ip_hdr(seg);
__udpv4_gso_segment_csum(seg,
&iph2->saddr, &iph->saddr,
&uh2->source, &uh->source);
__udpv4_gso_segment_csum(seg,
&iph2->daddr, &iph->daddr,
&uh2->dest, &uh->dest);
}
return segs;
}
static struct sk_buff *__udp_gso_segment_list(struct sk_buff *skb,
netdev_features_t features)
netdev_features_t features,
bool is_ipv6)
{
unsigned int mss = skb_shinfo(skb)->gso_size;
@ -198,11 +257,11 @@ static struct sk_buff *__udp_gso_segment_list(struct sk_buff *skb,
udp_hdr(skb)->len = htons(sizeof(struct udphdr) + mss);
return skb;
return is_ipv6 ? skb : __udpv4_gso_segment_list_csum(skb);
}
struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
netdev_features_t features)
netdev_features_t features, bool is_ipv6)
{
struct sock *sk = gso_skb->sk;
unsigned int sum_truesize = 0;
@ -214,7 +273,7 @@ struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
__be16 newlen;
if (skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST)
return __udp_gso_segment_list(gso_skb, features);
return __udp_gso_segment_list(gso_skb, features, is_ipv6);
mss = skb_shinfo(gso_skb)->gso_size;
if (gso_skb->len <= sizeof(*uh) + mss)
@ -328,7 +387,7 @@ static struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb,
goto out;
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
return __udp_gso_segment(skb, features);
return __udp_gso_segment(skb, features, false);
mss = skb_shinfo(skb)->gso_size;
if (unlikely(skb->len <= mss))

2
net/ipv6/udp_offload.c
View File

@ -42,7 +42,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
goto out;
if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4)
return __udp_gso_segment(skb, features);
return __udp_gso_segment(skb, features, true);
mss = skb_shinfo(skb)->gso_size;
if (unlikely(skb->len <= mss))