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util: move IP stuff from util.[ch] to ip.[ch]

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Introduce ip.[ch] file to encapsulate IP protocol handling functions and
structures.  Modify various files to include the new header ip.h when
it's needed.

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-ID: <20240303135114.1023026-5-lvivier@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Laurent Vivier 2024-03-06 16:58:33 +11:00 • committed by Stefano Brivio
parent e289d287c6
commit 324bd46782
17 changed files with 175 additions and 136 deletions

55
util.c
View file

@ -32,61 +32,6 @@
#include "packet.h"
#include "log.h"
#define IPV6_NH_OPT(nh) \
((nh) == 0 || (nh) == 43 || (nh) == 44 || (nh) == 50 || \
(nh) == 51 || (nh) == 60 || (nh) == 135 || (nh) == 139 || \
(nh) == 140 || (nh) == 253 || (nh) == 254)
/**
* ipv6_l4hdr() - Find pointer to L4 header in IPv6 packet and extract protocol
* @p: Packet pool, packet number @idx has IPv6 header at @offset
* @idx: Index of packet in pool
* @offset: Pre-calculated IPv6 header offset
* @proto: Filled with L4 protocol number
* @dlen: Data length (payload excluding header extensions), set on return
*
* Return: pointer to L4 header, NULL if not found
*/
char *ipv6_l4hdr(const struct pool *p, int idx, size_t offset, uint8_t *proto,
size_t *dlen)
{
const struct ipv6_opt_hdr *o;
const struct ipv6hdr *ip6h;
char *base;
int hdrlen;
uint8_t nh;
base = packet_get(p, idx, 0, 0, NULL);
ip6h = packet_get(p, idx, offset, sizeof(*ip6h), dlen);
if (!ip6h)
return NULL;
offset += sizeof(*ip6h);
nh = ip6h->nexthdr;
if (!IPV6_NH_OPT(nh))
goto found;
while ((o = packet_get_try(p, idx, offset, sizeof(*o), dlen))) {
nh = o->nexthdr;
hdrlen = (o->hdrlen + 1) * 8;
if (IPV6_NH_OPT(nh))
offset += hdrlen;
else
goto found;
}
return NULL;
found:
if (nh == 59)
return NULL;
*proto = nh;
return base + offset;
}
/**
* sock_l4() - Create and bind socket for given L4, add to epoll list
* @c: Execution context