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Diffstat (limited to 'udp.c')
-rw-r--r--udp.c54
1 files changed, 17 insertions, 37 deletions
diff --git a/udp.c b/udp.c
index 8a93aad..01b03df 100644
--- a/udp.c
+++ b/udp.c
@@ -178,8 +178,7 @@ enum udp_iov_idx {
/* IOVs and msghdr arrays for receiving datagrams from sockets */
static struct iovec udp_iov_recv [UDP_MAX_FRAMES];
-static struct mmsghdr udp4_mh_recv [UDP_MAX_FRAMES];
-static struct mmsghdr udp6_mh_recv [UDP_MAX_FRAMES];
+static struct mmsghdr udp_mh_recv [UDP_MAX_FRAMES];
/* IOVs and msghdr arrays for sending "spliced" datagrams to sockets */
static union sockaddr_inany udp_splice_to;
@@ -222,6 +221,7 @@ void udp_update_l2_buf(const unsigned char *eth_d, const unsigned char *eth_s)
static void udp_iov_init_one(const struct ctx *c, size_t i)
{
struct udp_payload_t *payload = &udp_payload[i];
+ struct msghdr *mh = &udp_mh_recv[i].msg_hdr;
struct udp_meta_t *meta = &udp_meta[i];
struct iovec *siov = &udp_iov_recv[i];
struct iovec *tiov = udp_l2_iov[i];
@@ -236,27 +236,10 @@ static void udp_iov_init_one(const struct ctx *c, size_t i)
tiov[UDP_IOV_TAP] = tap_hdr_iov(c, &meta->taph);
tiov[UDP_IOV_PAYLOAD].iov_base = payload;
- /* It's useful to have separate msghdr arrays for receiving. Otherwise,
- * an IPv4 recv() will alter msg_namelen, so we'd have to reset it every
- * time or risk truncating the address on future IPv6 recv()s.
- */
- if (c->ifi4) {
- struct msghdr *mh = &udp4_mh_recv[i].msg_hdr;
-
- mh->msg_name = &meta->s_in;
- mh->msg_namelen = sizeof(struct sockaddr_in);
- mh->msg_iov = siov;
- mh->msg_iovlen = 1;
- }
-
- if (c->ifi6) {
- struct msghdr *mh = &udp6_mh_recv[i].msg_hdr;
-
- mh->msg_name = &meta->s_in;
- mh->msg_namelen = sizeof(struct sockaddr_in6);
- mh->msg_iov = siov;
- mh->msg_iovlen = 1;
- }
+ mh->msg_name = &meta->s_in;
+ mh->msg_namelen = sizeof(meta->s_in);
+ mh->msg_iov = siov;
+ mh->msg_iovlen = 1;
}
/**
@@ -506,10 +489,10 @@ static int udp_sock_recv(const struct ctx *c, int s, uint32_t events,
void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
uint32_t events, const struct timespec *now)
{
- struct mmsghdr *mmh_recv = ref.udp.v6 ? udp6_mh_recv : udp4_mh_recv;
+ const socklen_t sasize = sizeof(udp_meta[0].s_in);
int n, i;
- if ((n = udp_sock_recv(c, ref.fd, events, mmh_recv)) <= 0)
+ if ((n = udp_sock_recv(c, ref.fd, events, udp_mh_recv)) <= 0)
return;
/* We divide datagrams into batches based on how we need to send them,
@@ -518,6 +501,7 @@ void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
* populate it one entry *ahead* of the loop counter.
*/
udp_meta[0].tosidx = udp_flow_from_sock(c, ref, &udp_meta[0].s_in, now);
+ udp_mh_recv[0].msg_hdr.msg_namelen = sasize;
for (i = 0; i < n; ) {
flow_sidx_t batchsidx = udp_meta[i].tosidx;
uint8_t batchpif = pif_at_sidx(batchsidx);
@@ -525,9 +509,9 @@ void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
do {
if (pif_is_socket(batchpif)) {
- udp_splice_prepare(mmh_recv, i);
+ udp_splice_prepare(udp_mh_recv, i);
} else if (batchpif == PIF_TAP) {
- udp_tap_prepare(mmh_recv, i,
+ udp_tap_prepare(udp_mh_recv, i,
flowside_at_sidx(batchsidx));
}
@@ -537,6 +521,7 @@ void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
udp_meta[i].tosidx = udp_flow_from_sock(c, ref,
&udp_meta[i].s_in,
now);
+ udp_mh_recv[i].msg_hdr.msg_namelen = sasize;
} while (flow_sidx_eq(udp_meta[i].tosidx, batchsidx));
if (pif_is_socket(batchpif)) {
@@ -572,19 +557,16 @@ void udp_listen_sock_handler(const struct ctx *c, union epoll_ref ref,
void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
uint32_t events, const struct timespec *now)
{
- const struct flowside *fromside = flowside_at_sidx(ref.flowside);
flow_sidx_t tosidx = flow_sidx_opposite(ref.flowside);
const struct flowside *toside = flowside_at_sidx(tosidx);
struct udp_flow *uflow = udp_at_sidx(ref.flowside);
int from_s = uflow->s[ref.flowside.sidei];
- bool v6 = !inany_v4(&fromside->eaddr);
- struct mmsghdr *mmh_recv = v6 ? udp6_mh_recv : udp4_mh_recv;
uint8_t topif = pif_at_sidx(tosidx);
int n, i;
ASSERT(!c->no_udp && uflow);
- if ((n = udp_sock_recv(c, from_s, events, mmh_recv)) <= 0)
+ if ((n = udp_sock_recv(c, from_s, events, udp_mh_recv)) <= 0)
return;
flow_trace(uflow, "Received %d datagrams on reply socket", n);
@@ -592,9 +574,11 @@ void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
for (i = 0; i < n; i++) {
if (pif_is_socket(topif))
- udp_splice_prepare(mmh_recv, i);
+ udp_splice_prepare(udp_mh_recv, i);
else if (topif == PIF_TAP)
- udp_tap_prepare(mmh_recv, i, toside);
+ udp_tap_prepare(udp_mh_recv, i, toside);
+ /* Restore sockaddr length clobbered by recvmsg() */
+ udp_mh_recv[i].msg_hdr.msg_namelen = sizeof(udp_meta[i].s_in);
}
if (pif_is_socket(topif)) {
@@ -740,8 +724,6 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
uref.pif = PIF_HOST;
if ((af == AF_INET || af == AF_UNSPEC) && c->ifi4) {
- uref.v6 = 0;
-
if (!ns) {
r4 = s = sock_l4(c, AF_INET, EPOLL_TYPE_UDP_LISTEN,
addr, ifname, port, uref.u32);
@@ -756,8 +738,6 @@ int udp_sock_init(const struct ctx *c, int ns, sa_family_t af,
}
if ((af == AF_INET6 || af == AF_UNSPEC) && c->ifi6) {
- uref.v6 = 1;
-
if (!ns) {
r6 = s = sock_l4(c, AF_INET6, EPOLL_TYPE_UDP_LISTEN,
addr, ifname, port, uref.u32);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-09 23:03:15 +0000