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tap: export pool_flush()/tapX_handler()/packet_add()

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Signed-off-by: Laurent Vivier <lvivier@redhat.com>
This commit is contained in:
Laurent Vivier 2024-02-02 15:23:19 +01:00
parent 9cc20cbdb1
commit 4d7ca742ef
2 changed files with 56 additions and 49 deletions
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98
tap.c
View file

@ -1011,6 +1011,45 @@ append:
return in->count;
}
void pool_flush_all(void)
{
pool_flush(pool_tap4);
pool_flush(pool_tap6);
}
void tap_handler_all(struct ctx *c, const struct timespec *now)
{
tap4_handler(c, pool_tap4, now);
tap6_handler(c, pool_tap6, now);
}
void packet_add_all_do(struct ctx *c, ssize_t len, char *p,
const char *func, int line)
{
const struct ethhdr *eh;
pcap(p, len);
eh = (struct ethhdr *)p;
if (memcmp(c->mac_guest, eh->h_source, ETH_ALEN)) {
memcpy(c->mac_guest, eh->h_source, ETH_ALEN);
proto_update_l2_buf(c->mac_guest, NULL);
}
switch (ntohs(eh->h_proto)) {
case ETH_P_ARP:
case ETH_P_IP:
packet_add_do(pool_tap4, len, p, func, line);
break;
case ETH_P_IPV6:
packet_add_do(pool_tap6, len, p, func, line);
break;
default:
break;
}
}
/**
* tap_sock_reset() - Handle closing or failure of connect AF_UNIX socket
* @c: Execution context
@ -1037,7 +1076,6 @@ static void tap_sock_reset(struct ctx *c)
void tap_handler_passt(struct ctx *c, uint32_t events,
const struct timespec *now)
{
const struct ethhdr *eh;
ssize_t n, rem;
char *p;
@ -1050,8 +1088,7 @@ redo:
p = pkt_buf;
rem = 0;
pool_flush(pool_tap4);
pool_flush(pool_tap6);
pool_flush_all();
n = recv(c->fd_tap, p, TAP_BUF_FILL, MSG_DONTWAIT);
if (n < 0) {
@ -1078,37 +1115,18 @@ redo:
/* Complete the partial read above before discarding a malformed
* frame, otherwise the stream will be inconsistent.
*/
if (len < (ssize_t)sizeof(*eh) || len > (ssize_t)ETH_MAX_MTU)
if (len < (ssize_t)sizeof(struct ethhdr) ||
len > (ssize_t)ETH_MAX_MTU)
goto next;
pcap(p, len);
eh = (struct ethhdr *)p;
if (memcmp(c->mac_guest, eh->h_source, ETH_ALEN)) {
memcpy(c->mac_guest, eh->h_source, ETH_ALEN);
proto_update_l2_buf(c->mac_guest, NULL);
}
switch (ntohs(eh->h_proto)) {
case ETH_P_ARP:
case ETH_P_IP:
packet_add(pool_tap4, len, p);
break;
case ETH_P_IPV6:
packet_add(pool_tap6, len, p);
break;
default:
break;
}
packet_add_all(c, len, p);
next:
p += len;
n -= len;
}
tap4_handler(c, pool_tap4, now);
tap6_handler(c, pool_tap6, now);
tap_handler_all(c, now);
/* We can't use EPOLLET otherwise. */
if (rem)
@ -1133,35 +1151,18 @@ void tap_handler_pasta(struct ctx *c, uint32_t events,
redo:
n = 0;
pool_flush(pool_tap4);
pool_flush(pool_tap6);
pool_flush_all();
restart:
while ((len = read(c->fd_tap, pkt_buf + n, TAP_BUF_BYTES - n)) > 0) {
const struct ethhdr *eh = (struct ethhdr *)(pkt_buf + n);
if (len < (ssize_t)sizeof(*eh) || len > (ssize_t)ETH_MAX_MTU) {
if (len < (ssize_t)sizeof(struct ethhdr) ||
len > (ssize_t)ETH_MAX_MTU) {
n += len;
continue;
}
pcap(pkt_buf + n, len);
if (memcmp(c->mac_guest, eh->h_source, ETH_ALEN)) {
memcpy(c->mac_guest, eh->h_source, ETH_ALEN);
proto_update_l2_buf(c->mac_guest, NULL);
}
switch (ntohs(eh->h_proto)) {
case ETH_P_ARP:
case ETH_P_IP:
packet_add(pool_tap4, len, pkt_buf + n);
break;
case ETH_P_IPV6:
packet_add(pool_tap6, len, pkt_buf + n);
break;
default:
break;
}
packet_add_all(c, len, pkt_buf + n);
if ((n += len) == TAP_BUF_BYTES)
break;
@ -1172,8 +1173,7 @@ restart:
ret = errno;
tap4_handler(c, pool_tap4, now);
tap6_handler(c, pool_tap6, now);
tap_handler_all(c, now);
if (len > 0 || ret == EAGAIN)
return;

7
tap.h
View file

@ -98,5 +98,12 @@ void tap_handler_pasta(struct ctx *c, uint32_t events,
void tap_handler_passt(struct ctx *c, uint32_t events,
const struct timespec *now);
void tap_sock_init(struct ctx *c);
void pool_flush_all(void);
void tap_handler_all(struct ctx *c, const struct timespec *now);
void packet_add_do(struct pool *p, size_t len, const char *start,
const char *func, int line);
#define packet_add_all(p, len, start) \
packet_add_all_do(p, len, start, __func__, __LINE__)
#endif /* TAP_H */