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-rw-r--r--sysdep/bsd/sysio.h110
-rw-r--r--sysdep/linux/sysio.h87
-rw-r--r--sysdep/unix/io.c143
3 files changed, 319 insertions, 21 deletions
diff --git a/sysdep/bsd/sysio.h b/sysdep/bsd/sysio.h
index 80f8f942..9ee4ade3 100644
--- a/sysdep/bsd/sysio.h
+++ b/sysdep/bsd/sysio.h
@@ -11,21 +11,39 @@
static inline void
set_inaddr(struct in6_addr * ia, ip_addr a)
{
- ipa_hton(a);
- memcpy(ia, &a, sizeof(a));
+ ipa_hton(a);
+ memcpy(ia, &a, sizeof(a));
+}
+
+static inline void
+get_inaddr(ip_addr *a, struct in6_addr *ia)
+{
+ memcpy(a, ia, sizeof(*a));
+ ipa_ntoh(*a);
}
#else
#include <net/if.h>
+#include <net/if_dl.h>
static inline void
set_inaddr(struct in_addr * ia, ip_addr a)
{
- ipa_hton(a);
- memcpy(&ia->s_addr, &a, sizeof(a));
+ ipa_hton(a);
+ memcpy(&ia->s_addr, &a, sizeof(a));
+}
+
+static inline void
+get_inaddr(ip_addr *a, struct in_addr *ia)
+{
+ memcpy(a, &ia->s_addr, sizeof(*a));
+ ipa_ntoh(*a);
}
+
+/* BSD Multicast handling for IPv4 */
+
static inline char *
sysio_setup_multicast(sock *s)
{
@@ -80,6 +98,90 @@ sysio_leave_group(sock *s, ip_addr maddr)
return NULL;
}
+
+/* BSD RX/TX packet info handling for IPv4 */
+/* it uses IP_RECVDSTADDR / IP_RECVIF socket options instead of IP_PKTINFO */
+
+#define CMSG_RX_SPACE (CMSG_SPACE(sizeof(struct in_addr)) + CMSG_SPACE(sizeof(struct sockaddr_dl)))
+#define CMSG_TX_SPACE CMSG_SPACE(sizeof(struct in_addr))
+
+static char *
+sysio_register_cmsgs(sock *s)
+{
+ int ok = 1;
+ if (s->flags & SKF_LADDR_RX)
+ {
+ if (setsockopt(s->fd, IPPROTO_IP, IP_RECVDSTADDR, &ok, sizeof(ok)) < 0)
+ return "IP_RECVDSTADDR";
+
+ if (setsockopt(s->fd, IPPROTO_IP, IP_RECVIF, &ok, sizeof(ok)) < 0)
+ return "IP_RECVIF";
+ }
+
+ return NULL;
+}
+
+static void
+sysio_process_rx_cmsgs(sock *s, struct msghdr *msg)
+{
+ struct cmsghdr *cm;
+
+ if (!(s->flags & SKF_LADDR_RX))
+ return;
+
+ s->laddr = IPA_NONE;
+ s->lifindex = 0;
+
+ for (cm = CMSG_FIRSTHDR(msg); cm != NULL; cm = CMSG_NXTHDR(msg, cm))
+ {
+ if (cm->cmsg_level == IPPROTO_IP && cm->cmsg_type == IP_RECVDSTADDR)
+ {
+ struct in_addr *ra = (struct in_addr *) CMSG_DATA(cm);
+ get_inaddr(&s->laddr, ra);
+ }
+
+ if (cm->cmsg_level == IPPROTO_IP && cm->cmsg_type == IP_RECVIF)
+ {
+ struct sockaddr_dl *ri = (struct sockaddr_dl *) CMSG_DATA(cm);
+ s->lifindex = ri->sdl_index;
+ }
+ }
+
+ // log(L_WARN "RX %I %d", s->laddr, s->lifindex);
+}
+
+
+void
+sysio_prepare_tx_cmsgs(sock *s, struct msghdr *msg)
+{
+ struct cmsghdr *cm;
+ struct in_addr *sa;
+
+ if (!(s->flags & SKF_LADDR_TX))
+ {
+ msg->msg_controllen = 0;
+ return;
+ }
+
+ if (s->iface)
+ {
+ struct in_addr m;
+// set_inaddr(&m, s->iface->addr->ip);
+ set_inaddr(&m, s->saddr);
+ setsockopt(s->fd, IPPROTO_IP, IP_MULTICAST_IF, &m, sizeof(m));
+ }
+
+ cm = CMSG_FIRSTHDR(msg);
+ cm->cmsg_level = IPPROTO_IP;
+ cm->cmsg_type = IP_SENDSRCADDR;
+ cm->cmsg_len = CMSG_LEN(sizeof(*sa));
+
+ sa = (struct in_addr *) CMSG_DATA(cm);
+ set_inaddr(sa, s->saddr);
+
+ msg->msg_controllen = cm->cmsg_len;
+}
+
#endif
diff --git a/sysdep/linux/sysio.h b/sysdep/linux/sysio.h
index 70d35ccf..07f2cb15 100644
--- a/sysdep/linux/sysio.h
+++ b/sysdep/linux/sysio.h
@@ -21,6 +21,13 @@ set_inaddr(struct in6_addr *ia, ip_addr a)
memcpy(ia, &a, sizeof(a));
}
+static inline void
+get_inaddr(ip_addr *a, struct in6_addr *ia)
+{
+ memcpy(a, ia, sizeof(*a));
+ ipa_ntoh(*a);
+}
+
#else
#include <net/if.h>
@@ -32,6 +39,13 @@ set_inaddr(struct in_addr *ia, ip_addr a)
memcpy(&ia->s_addr, &a, sizeof(a));
}
+static inline void
+get_inaddr(ip_addr *a, struct in_addr *ia)
+{
+ memcpy(a, &ia->s_addr, sizeof(*a));
+ ipa_ntoh(*a);
+}
+
/*
* Multicasting in Linux systems is a real mess. Not only different kernels
* have different interfaces, but also different libc's export it in different
@@ -209,3 +223,76 @@ sk_set_md5_auth_int(sock *s, sockaddr *sa, char *passwd)
return rv;
}
+
+
+#ifndef IPV6
+
+/* RX/TX packet info handling for IPv4 */
+/* Mostly similar to standardized IPv6 code */
+
+#define CMSG_RX_SPACE CMSG_SPACE(sizeof(struct in_pktinfo))
+#define CMSG_TX_SPACE CMSG_SPACE(sizeof(struct in_pktinfo))
+
+static char *
+sysio_register_cmsgs(sock *s)
+{
+ int ok = 1;
+ if ((s->flags & SKF_LADDR_RX) &&
+ setsockopt(s->fd, IPPROTO_IP, IP_PKTINFO, &ok, sizeof(ok)) < 0)
+ return "IP_PKTINFO";
+
+ return NULL;
+}
+
+static void
+sysio_process_rx_cmsgs(sock *s, struct msghdr *msg)
+{
+ struct cmsghdr *cm;
+ struct in_pktinfo *pi = NULL;
+
+ if (!(s->flags & SKF_LADDR_RX))
+ return;
+
+ for (cm = CMSG_FIRSTHDR(msg); cm != NULL; cm = CMSG_NXTHDR(msg, cm))
+ {
+ if (cm->cmsg_level == IPPROTO_IP && cm->cmsg_type == IP_PKTINFO)
+ pi = (struct in_pktinfo *) CMSG_DATA(cm);
+ }
+
+ if (!pi)
+ {
+ s->laddr = IPA_NONE;
+ s->lifindex = 0;
+ return;
+ }
+
+ get_inaddr(&s->laddr, &pi->ipi_addr);
+ s->lifindex = pi->ipi_ifindex;
+ return;
+}
+
+
+void
+sysio_prepare_tx_cmsgs(sock *s, struct msghdr *msg)
+{
+ struct cmsghdr *cm;
+ struct in_pktinfo *pi;
+
+ if (!(s->flags & SKF_LADDR_TX))
+ {
+ msg->msg_controllen = 0;
+ return;
+ }
+
+ cm = CMSG_FIRSTHDR(msg);
+ cm->cmsg_level = IPPROTO_IP;
+ cm->cmsg_type = IP_PKTINFO;
+ cm->cmsg_len = CMSG_LEN(sizeof(*pi));
+
+ pi = (struct in_pktinfo *) CMSG_DATA(cm);
+ set_inaddr(&pi->ipi_spec_dst, s->saddr);
+ pi->ipi_ifindex = s->iface ? s->iface->index : 0;
+
+ msg->msg_controllen = cm->cmsg_len;
+}
+#endif
diff --git a/sysdep/unix/io.c b/sysdep/unix/io.c
index 296b6b3a..316244d7 100644
--- a/sysdep/unix/io.c
+++ b/sysdep/unix/io.c
@@ -682,7 +682,7 @@ static char *
sk_setup(sock *s)
{
int fd = s->fd;
- char *err;
+ char *err = NULL;
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
ERR("fcntl(O_NONBLOCK)");
@@ -701,9 +701,8 @@ sk_setup(sock *s)
if (s->ttl >= 0)
err = sk_set_ttl_int(s);
- else
- err = NULL;
+ sysio_register_cmsgs(s);
bad:
return err;
}
@@ -854,6 +853,72 @@ sk_leave_group(sock *s, ip_addr maddr)
return 0;
}
+/* PKTINFO handling is also standardized in IPv6 */
+#define CMSG_RX_SPACE CMSG_SPACE(sizeof(struct in6_pktinfo))
+
+static char *
+sysio_register_cmsgs(sock *s)
+{
+ int ok = 1;
+ if ((s->flags & SKF_LADDR_RX) &&
+ setsockopt(s->fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &ok, sizeof(ok)) < 0)
+ return "IPV6_RECVPKTINFO";
+
+ return NULL;
+}
+
+void
+sysio_process_rx_cmsgs(sock *s, struct msghdr *msg)
+{
+ struct cmsghdr *cm;
+ struct in6_pktinfo *pi = NULL;
+
+ if (!(s->flags & SKF_LADDR_RX))
+ return;
+
+ for (cm = CMSG_FIRSTHDR(msg); cm != NULL; cm = CMSG_NXTHDR(msg, cm))
+ {
+ if (cm->cmsg_level == IPPROTO_IPV6 && cm->cmsg_type == IPV6_PKTINFO)
+ pi = (struct in6_pktinfo *) CMSG_DATA(cm);
+ }
+
+ if (!pi)
+ {
+ s->laddr = IPA_NONE;
+ s->lifindex = 0;
+ return;
+ }
+
+ get_inaddr(&s->laddr, &pi->ipi6_addr);
+ s->lifindex = pi->ipi6_ifindex;
+ return;
+}
+
+void
+sysio_prepare_tx_cmsgs(sock *s, struct msghdr *msg)
+{
+ struct cmsghdr *cm;
+ struct in6_pktinfo *pi;
+
+ if (!(s->flags & SKF_LADDR_TX))
+ {
+ msg->msg_controllen = 0;
+ return;
+ }
+
+ cm = CMSG_FIRSTHDR(msg);
+ cm->cmsg_level = IPPROTO_IPV6;
+ cm->cmsg_type = PIV6_PKTINFO;
+ cm->cmsg_len = CMSG_LEN(sizeof(*pi));
+
+ pi = (struct in6_pktinfo *) CMSG_DATA(cm);
+ set_inaddr(&pi->ipi6_addr, s->saddr);
+ pi->ipi6_ifindex = s->iface ? s->iface->index : 0;
+
+ msg->msg_controllen = cmsg->cmsg_len;
+ return;
+}
+
#else /* IPV4 */
int
@@ -1107,6 +1172,8 @@ bad:
return -1;
}
+static inline void reset_tx_buffer(sock *s) { s->ttx = s->tpos = s->tbuf; }
+
static int
sk_maybe_write(sock *s)
{
@@ -1124,7 +1191,7 @@ sk_maybe_write(sock *s)
{
if (errno != EINTR && errno != EAGAIN)
{
- s->ttx = s->tpos; /* empty tx buffer */
+ reset_tx_buffer(s);
s->err_hook(s, errno);
return -1;
}
@@ -1132,30 +1199,44 @@ sk_maybe_write(sock *s)
}
s->ttx += e;
}
- s->ttx = s->tpos = s->tbuf;
+ reset_tx_buffer(s);
return 1;
case SK_UDP:
case SK_IP:
{
- sockaddr sa;
-
if (s->tbuf == s->tpos)
return 1;
- fill_in_sockaddr(&sa, s->faddr, s->fport);
+ sockaddr sa;
+ fill_in_sockaddr(&sa, s->daddr, s->dport);
fill_in_sockifa(&sa, s->iface);
- e = sendto(s->fd, s->tbuf, s->tpos - s->tbuf, 0, (struct sockaddr *) &sa, sizeof(sa));
+
+ struct iovec iov = {s->tbuf, s->tpos - s->tbuf};
+ byte cmsg_buf[CMSG_TX_SPACE];
+
+ struct msghdr msg = {
+ .msg_name = &sa,
+ .msg_namelen = sizeof(sa),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = cmsg_buf,
+ .msg_controllen = sizeof(cmsg_buf),
+ .msg_flags = 0};
+
+ sysio_prepare_tx_cmsgs(s, &msg);
+ e = sendmsg(s->fd, &msg, 0);
+
if (e < 0)
{
if (errno != EINTR && errno != EAGAIN)
{
- s->ttx = s->tpos; /* empty tx buffer */
+ reset_tx_buffer(s);
s->err_hook(s, errno);
return -1;
}
return 0;
}
- s->tpos = s->tbuf;
+ reset_tx_buffer(s);
return 1;
}
default:
@@ -1201,8 +1282,6 @@ sk_rx_ready(sock *s)
int
sk_send(sock *s, unsigned len)
{
- s->faddr = s->daddr;
- s->fport = s->dport;
s->ttx = s->tbuf;
s->tpos = s->tbuf + len;
return sk_maybe_write(s);
@@ -1221,13 +1300,28 @@ sk_send(sock *s, unsigned len)
int
sk_send_to(sock *s, unsigned len, ip_addr addr, unsigned port)
{
- s->faddr = addr;
- s->fport = port;
+ s->daddr = addr;
+ s->dport = port;
s->ttx = s->tbuf;
s->tpos = s->tbuf + len;
return sk_maybe_write(s);
}
+/*
+int
+sk_send_full(sock *s, unsigned len, struct iface *ifa,
+ ip_addr saddr, ip_addr daddr, unsigned dport)
+{
+ s->iface = ifa;
+ s->saddr = saddr;
+ s->daddr = daddr;
+ s->dport = dport;
+ s->ttx = s->tbuf;
+ s->tpos = s->tbuf + len;
+ return sk_maybe_write(s);
+}
+*/
+
static int
sk_read(sock *s)
{
@@ -1273,8 +1367,21 @@ sk_read(sock *s)
default:
{
sockaddr sa;
- int al = sizeof(sa);
- int e = recvfrom(s->fd, s->rbuf, s->rbsize, 0, (struct sockaddr *) &sa, &al);
+ int e;
+
+ struct iovec iov = {s->rbuf, s->rbsize};
+ byte cmsg_buf[CMSG_RX_SPACE];
+
+ struct msghdr msg = {
+ .msg_name = &sa,
+ .msg_namelen = sizeof(sa),
+ .msg_iov = &iov,
+ .msg_iovlen = 1,
+ .msg_control = cmsg_buf,
+ .msg_controllen = sizeof(cmsg_buf),
+ .msg_flags = 0};
+
+ e = recvmsg(s->fd, &msg, 0);
if (e < 0)
{
@@ -1284,6 +1391,8 @@ sk_read(sock *s)
}
s->rpos = s->rbuf + e;
get_sockaddr(&sa, &s->faddr, &s->fport, 1);
+ sysio_process_rx_cmsgs(s, &msg);
+
s->rx_hook(s, e);
return 1;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-24 18:05:19 +0000