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flow: Support rt_hdr in parse_ipv6_ext_hdrs().

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Checks whether IPPROTO_ROUTING exists in the IPv6 extension headers.
If it exists, the first address is retrieved.

If NULL is specified for "frag_hdr" and/or "rt_hdr", those addresses in
the header are not reported to the caller. Of course, "frag_hdr" and
"rt_hdr" are properly parsed inside this function.

Signed-off-by: Nobuhiro MIKI <nmiki@yahoo-corp.jp>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This commit is contained in:
Nobuhiro MIKI
2023-03-29 14:51:16 +09:00
committed by Ilya Maximets
parent 57b9fc50dd
commit 349112f975
5 changed files with 58 additions and 21 deletions
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48
lib/flow.c
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@@ -479,9 +479,17 @@ invalid:
static inline bool
parse_ipv6_ext_hdrs__(const void **datap, size_t *sizep, uint8_t *nw_proto,
uint8_t *nw_frag,
const struct ovs_16aligned_ip6_frag **frag_hdr)
const struct ovs_16aligned_ip6_frag **frag_hdr,
const struct ip6_rt_hdr **rt_hdr)
{
*frag_hdr = NULL;
if (frag_hdr) {
*frag_hdr = NULL;
}
if (rt_hdr) {
*rt_hdr = NULL;
}
while (1) {
if (OVS_LIKELY((*nw_proto != IPPROTO_HOPOPTS)
&& (*nw_proto != IPPROTO_ROUTING)
@@ -504,7 +512,6 @@ parse_ipv6_ext_hdrs__(const void **datap, size_t *sizep, uint8_t *nw_proto,
}
if ((*nw_proto == IPPROTO_HOPOPTS)
|| (*nw_proto == IPPROTO_ROUTING)
|| (*nw_proto == IPPROTO_DSTOPTS)) {
/* These headers, while different, have the fields we care
* about in the same location and with the same
@@ -515,6 +522,18 @@ parse_ipv6_ext_hdrs__(const void **datap, size_t *sizep, uint8_t *nw_proto,
(ext_hdr->ip6e_len + 1) * 8))) {
return false;
}
} else if (*nw_proto == IPPROTO_ROUTING) {
const struct ip6_rt_hdr *tmp;
if (!rt_hdr) {
rt_hdr = &tmp;
}
*rt_hdr = *datap;
*nw_proto = (*rt_hdr)->nexthdr;
if (OVS_UNLIKELY(!data_try_pull(datap, sizep,
((*rt_hdr)->hdrlen + 1) * 8))) {
return false;
}
} else if (*nw_proto == IPPROTO_AH) {
/* A standard AH definition isn't available, but the fields
* we care about are in the same location as the generic
@@ -527,6 +546,11 @@ parse_ipv6_ext_hdrs__(const void **datap, size_t *sizep, uint8_t *nw_proto,
return false;
}
} else if (*nw_proto == IPPROTO_FRAGMENT) {
const struct ovs_16aligned_ip6_frag *tmp;
if (!frag_hdr) {
frag_hdr = &tmp;
}
*frag_hdr = *datap;
*nw_proto = (*frag_hdr)->ip6f_nxt;
@@ -561,15 +585,19 @@ parse_ipv6_ext_hdrs__(const void **datap, size_t *sizep, uint8_t *nw_proto,
* has FLOW_NW_FRAG_LATER set. Both first and later fragments have
* FLOW_NW_FRAG_ANY set in 'nw_frag'.
*
* If a routing header is found, '*rt_hdr' is set to the routing
* header and otherwise set to NULL.
*
* A return value of false indicates that there was a problem parsing
* the extension headers.*/
bool
parse_ipv6_ext_hdrs(const void **datap, size_t *sizep, uint8_t *nw_proto,
uint8_t *nw_frag,
const struct ovs_16aligned_ip6_frag **frag_hdr)
const struct ovs_16aligned_ip6_frag **frag_hdr,
const struct ip6_rt_hdr **rt_hdr)
{
return parse_ipv6_ext_hdrs__(datap, sizep, nw_proto, nw_frag,
frag_hdr);
frag_hdr, rt_hdr);
}
bool
@@ -945,9 +973,8 @@ miniflow_extract(struct dp_packet *packet, struct miniflow *dst)
nw_ttl = nh->ip6_hlim;
nw_proto = nh->ip6_nxt;
const struct ovs_16aligned_ip6_frag *frag_hdr;
if (!parse_ipv6_ext_hdrs__(&data, &size, &nw_proto, &nw_frag,
&frag_hdr)) {
if (!parse_ipv6_ext_hdrs(&data, &size, &nw_proto, &nw_frag,
NULL, NULL)) {
goto out;
}
@@ -1200,10 +1227,9 @@ parse_tcp_flags(struct dp_packet *packet,
plen = ntohs(nh->ip6_plen); /* Never pull padding. */
dp_packet_set_l2_pad_size(packet, size - plen);
size = plen;
const struct ovs_16aligned_ip6_frag *frag_hdr;
nw_proto = nh->ip6_nxt;
if (!parse_ipv6_ext_hdrs__(&data, &size, &nw_proto, &nw_frag,
&frag_hdr)) {
if (!parse_ipv6_ext_hdrs(&data, &size, &nw_proto, &nw_frag,
NULL, NULL)) {
return 0;
}
} else {