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IO: Minor changes in socket AF handing

Browse Source 
AF can be specified implicitly by saddr or daddr, flags SKF_V4ONLY and
SKF_V6ONLY are to be removed.
This commit is contained in:
Ondrej Zajicek (work) 2016-05-17 15:21:49 +02:00
parent 5af7b59660
commit 08b3a24da5
10 changed files with 91 additions and 77 deletions
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46
lib/socket.h
View File

@ -17,6 +17,7 @@ typedef struct birdsock {
resource r;
pool *pool; /* Pool where incoming connections should be allocated (for SK_xxx_PASSIVE) */
int type; /* Socket type */
int subtype; /* Socket subtype */
void *data; /* User data */
ip_addr saddr, daddr; /* IPA_NONE = unspecified */
uint sport, dport; /* 0 = unspecified (for IP: protocol type) */
@ -44,7 +45,7 @@ typedef struct birdsock {
uint lifindex; /* local interface that received the datagram */
/* laddr and lifindex are valid only if SKF_LADDR_RX flag is set to request it */
int fam; /* Address family (SK_FAM_* or 0 for non-IP) of fd */
int af; /* System-dependend adress family (e.g. AF_INET) */
int fd; /* System-dependent data */
int index; /* Index in poll buffer */
int rcv_ttl; /* TTL of last received datagram */
@ -91,7 +92,6 @@ extern int sk_priority_control; /* Suggested priority for control traffic, shou
/* Socket flags */
#define SKF_V4ONLY 0x01 /* Use IPv4 for IP sockets */
#define SKF_V6ONLY 0x02 /* Use IPV6_V6ONLY socket option */
#define SKF_LADDR_RX 0x04 /* Report local address for RX packets */
#define SKF_TTL_RX 0x08 /* Report TTL / Hop Limit for RX packets */
@ -116,31 +116,35 @@ extern int sk_priority_control; /* Suggested priority for control traffic, shou
#define SK_UNIX_PASSIVE 8
#define SK_UNIX 9
/* Socket families */
/*
* Socket subtypes
*/
#define SK_FAM_NONE 0
#define SK_FAM_IPV4 4
#define SK_FAM_IPV6 6
#define SK_IPV4 1
#define SK_IPV6 2
/*
* For SK_UDP or SK_IP sockets setting DA/DP allows to use sk_send(),
* otherwise sk_send_to() must be used.
* For TCP/IP sockets, Address family (IPv4 or IPv6) can be specified either
* explicitly (SK_IPV4 or SK_IPV6) or implicitly (based on saddr, daddr). But
* these specifications must be consistent.
*
* For SK_IP sockets setting DP specifies protocol number, which is used
* for both receiving and sending.
* For SK_UDP or SK_IP sockets setting DA/DP allows to use sk_send(), otherwise
* sk_send_to() must be used.
*
* For multicast on SK_UDP or SK_IP sockets set IF and TTL,
* call sk_setup_multicast() to enable multicast on that socket,
* and then use sk_join_group() and sk_leave_group() to manage
* a set of received multicast groups.
* For SK_IP sockets setting DP specifies protocol number, which is used for
* both receiving and sending.
*
* For datagram (SK_UDP, SK_IP) sockets, there are two ways to handle
* source address. The socket could be bound to it using bind()
* syscall, but that also forbids the reception of multicast packets,
* or the address could be set on per-packet basis using platform
* dependent options (but these are not available in some corner
* cases). The first way is used when SKF_BIND is specified, the
* second way is used otherwise.
* For multicast on SK_UDP or SK_IP sockets set IF and TTL, call
* sk_setup_multicast() to enable multicast on that socket, and then use
* sk_join_group() and sk_leave_group() to manage a set of received multicast
* groups.
*
* For datagram (SK_UDP, SK_IP) sockets, there are two ways to handle source
* address. The socket could be bound to it using bind() syscall, but that also
* forbids the reception of multicast packets, or the address could be set on
* per-packet basis using platform dependent options (but these are not
* available in some corner cases). The first way is used when SKF_BIND is
* specified, the second way is used otherwise.
*/
#endif

8
proto/bfd/bfd.c
View File

@ -981,10 +981,10 @@ bfd_start(struct proto *P)
add_tail(&bfd_proto_list, &p->bfd_node);
birdloop_enter(p->loop);
p->rx4_1 = bfd_open_rx_sk(p, 0, 4);
p->rx4_m = bfd_open_rx_sk(p, 1, 4);
p->rx6_1 = bfd_open_rx_sk(p, 0, 6);
p->rx6_m = bfd_open_rx_sk(p, 1, 6);
p->rx4_1 = bfd_open_rx_sk(p, 0, SK_IPV4);
p->rx4_m = bfd_open_rx_sk(p, 1, SK_IPV4);
p->rx6_1 = bfd_open_rx_sk(p, 0, SK_IPV6);
p->rx6_m = bfd_open_rx_sk(p, 1, SK_IPV6);
birdloop_leave(p->loop);
bfd_take_requests(p);

24
proto/bfd/packets.c
View File

@ -186,10 +186,11 @@ bfd_err_hook(sock *sk, int err)
}
sock *
bfd_open_rx_sk(struct bfd_proto *p, int multihop, int inet_version)
bfd_open_rx_sk(struct bfd_proto *p, int multihop, int af)
{
sock *sk = sk_new(p->tpool);
sk->type = SK_UDP;
sk->subtype = af;
sk->sport = !multihop ? BFD_CONTROL_PORT : BFD_MULTI_CTL_PORT;
sk->data = p;
@ -202,19 +203,6 @@ bfd_open_rx_sk(struct bfd_proto *p, int multihop, int inet_version)
sk->priority = sk_priority_control;
sk->flags = SKF_THREAD | SKF_LADDR_RX | (!multihop ? SKF_TTL_RX : 0);
switch (inet_version) {
case 4:
sk->fam = SK_FAM_IPV4;
sk->flags |= SKF_V4ONLY;
break;
case 6:
sk->fam = SK_FAM_IPV6;
sk->flags |= SKF_V6ONLY;
break;
default:
ASSERT(0);
}
if (sk_open(sk) < 0)
goto err;
@ -246,14 +234,6 @@ bfd_open_tx_sk(struct bfd_proto *p, ip_addr local, struct iface *ifa)
sk->ttl = ifa ? 255 : -1;
sk->flags = SKF_THREAD | SKF_BIND | SKF_HIGH_PORT;
if (ipa_is_ip4(local)) {
sk->fam = SK_FAM_IPV4;
sk->flags |= SKF_V4ONLY;
} else {
sk->fam = SK_FAM_IPV6;
sk->flags |= SKF_V6ONLY;
}
if (sk_open(sk) < 0)
goto err;

4
proto/ospf/iface.c
View File

@ -108,10 +108,10 @@ ospf_sk_open(struct ospf_iface *ifa)
sock *sk = sk_new(ifa->pool);
sk->type = SK_IP;
sk->subtype = ospf_is_v2(p) ? SK_IPV4 : SK_IPV6;
sk->dport = OSPF_PROTO;
sk->saddr = ifa->addr->ip;
sk->iface = ifa->iface;
sk->fam = ospf_is_v2(p) ? SK_FAM_IPV4 : SK_FAM_IPV6;
sk->tos = ifa->cf->tx_tos;
sk->priority = ifa->cf->tx_priority;
@ -193,8 +193,8 @@ ospf_open_vlink_sk(struct ospf_proto *p)
{
sock *sk = sk_new(p->p.pool);
sk->type = SK_IP;
sk->subtype = ospf_is_v2(p) ? SK_IPV4 : SK_IPV6;
sk->dport = OSPF_PROTO;
sk->fam = ospf_is_v2(p) ? SK_FAM_IPV4 : SK_FAM_IPV6;
/* FIXME: configurable tos/priority ? */
sk->tos = IP_PREC_INTERNET_CONTROL;

2
proto/radv/packets.c
View File

@ -410,9 +410,9 @@ radv_sk_open(struct radv_iface *ifa)
{
sock *sk = sk_new(ifa->ra->p.pool);
sk->type = SK_IP;
sk->subtype = SK_IPV6;
sk->dport = ICMPV6_PROTO;
sk->saddr = ifa->addr->ip;
sk->fam = SK_FAM_IPV6;
sk->ttl = 255; /* Mandatory for Neighbor Discovery packets */
sk->rx_hook = radv_rx_hook;

2
proto/rip/config.Y
View File

@ -123,7 +123,7 @@ rip_iface_item:
| MODE MULTICAST { RIP_IFACE->mode = RIP_IM_MULTICAST; }
| MODE BROADCAST { RIP_IFACE->mode = RIP_IM_BROADCAST; if (rip_cfg_is_ng()) cf_error("Broadcast not supported in RIPng"); }
| PASSIVE bool { RIP_IFACE->passive = $2; }
| ADDRESS ipa { RIP_IFACE->address = $2; }
| ADDRESS ipa { RIP_IFACE->address = $2; if (ipa_is_ip4($2) != rip_cfg_is_v2()) cf_error("IP address version mismatch"); }
| PORT expr { RIP_IFACE->port = $2; if (($2<1) || ($2>65535)) cf_error("Invalid port number"); }
| VERSION expr { RIP_IFACE->version = $2;
if (rip_cfg_is_ng()) cf_error("Version not supported in RIPng");

5
proto/rip/packets.c
View File

@ -715,7 +715,7 @@ rip_open_socket(struct rip_iface *ifa)
sock *sk = sk_new(p->p.pool);
sk->type = SK_UDP;
sk->fam = rip_is_v2(p) ? SK_FAM_IPV4 : SK_FAM_IPV6;
sk->subtype = rip_is_v2(p) ? SK_IPV4 : SK_IPV6;
sk->sport = ifa->cf->port;
sk->dport = ifa->cf->port;
sk->iface = ifa->iface;
@ -736,8 +736,7 @@ rip_open_socket(struct rip_iface *ifa)
sk->tos = ifa->cf->tx_tos;
sk->priority = ifa->cf->tx_priority;
sk->ttl = ifa->cf->ttl_security ? 255 : 1;
sk->flags = SKF_LADDR_RX | (rip_is_ng(p) ? SKF_V6ONLY : 0) |
((ifa->cf->ttl_security == 1) ? SKF_TTL_RX : 0);
sk->flags = SKF_LADDR_RX | ((ifa->cf->ttl_security == 1) ? SKF_TTL_RX : 0);
/* sk->rbsize and sk->tbsize are handled in rip_iface_update_buffers() */

2
sysdep/linux/sysio.h
View File

@ -184,7 +184,7 @@ sk_set_md5_auth(sock *s, ip_addr local UNUSED, ip_addr remote, struct iface *ifa
struct tcp_md5sig md5;
memset(&md5, 0, sizeof(md5));
sockaddr_fill((sockaddr *) &md5.tcpm_addr, fam_to_af[s->fam], remote, ifa, 0);
sockaddr_fill((sockaddr *) &md5.tcpm_addr, s->af, remote, ifa, 0);
if (passwd)
{

73
sysdep/unix/io.c
View File

@ -587,7 +587,6 @@ sockaddr_read(sockaddr *sa, int af, ip_addr *a, struct iface **ifa, uint *port)
return -1;
}
const int fam_to_af[] = { [SK_FAM_IPV4] = AF_INET, [SK_FAM_IPV6] = AF_INET6 };
/*
* IPv6 multicast syscalls
@ -1194,7 +1193,7 @@ sk_setup(sock *s)
if (fcntl(fd, F_SETFL, O_NONBLOCK) < 0)
ERR("O_NONBLOCK");
if (!s->fam)
if (!s->af)
return 0;
if (ipa_nonzero(s->saddr) && !(s->flags & SKF_BIND))
@ -1254,9 +1253,8 @@ sk_setup(sock *s)
if (sk_is_ipv6(s))
{
if (s->flags & SKF_V6ONLY)
if (setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, &y, sizeof(y)) < 0)
ERR("IPV6_V6ONLY");
if (setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, &y, sizeof(y)) < 0)
ERR("IPV6_V6ONLY");
if (s->flags & SKF_LADDR_RX)
if (sk_request_cmsg6_pktinfo(s) < 0)
@ -1295,7 +1293,7 @@ sk_tcp_connected(sock *s)
int sa_len = sizeof(sa);
if ((getsockname(s->fd, &sa.sa, &sa_len) < 0) ||
(sockaddr_read(&sa, fam_to_af[s->fam], &s->saddr, &s->iface, &s->sport) < 0))
(sockaddr_read(&sa, s->af, &s->saddr, &s->iface, &s->sport) < 0))
log(L_WARN "SOCK: Cannot get local IP address for TCP>");
s->type = SK_TCP;
@ -1320,7 +1318,7 @@ sk_passive_connected(sock *s, int type)
sock *t = sk_new(s->pool);
t->type = type;
t->fam = s->fam;
t->af = s->af;
t->fd = fd;
t->ttl = s->ttl;
t->tos = s->tos;
@ -1330,10 +1328,10 @@ sk_passive_connected(sock *s, int type)
if (type == SK_TCP)
{
if ((getsockname(fd, &loc_sa.sa, &loc_sa_len) < 0) ||
(sockaddr_read(&loc_sa, fam_to_af[s->fam], &t->saddr, &t->iface, &t->sport) < 0))
(sockaddr_read(&loc_sa, s->af, &t->saddr, &t->iface, &t->sport) < 0))
log(L_WARN "SOCK: Cannot get local IP address for TCP<");
if (sockaddr_read(&rem_sa, fam_to_af[s->fam], &t->daddr, &t->iface, &t->dport) < 0)
if (sockaddr_read(&rem_sa, s->af, &t->daddr, &t->iface, &t->dport) < 0)
log(L_WARN "SOCK: Cannot get remote IP address for TCP<");
}
@ -1368,40 +1366,74 @@ sk_passive_connected(sock *s, int type)
int
sk_open(sock *s)
{
int af = AF_UNSPEC;
int fd = -1;
int do_bind = 0;
int bind_port = 0;
ip_addr bind_addr = IPA_NONE;
sockaddr sa;
if (s->type <= SK_IP)
{
/*
* For TCP/IP sockets, Address family (IPv4 or IPv6) can be specified either
* explicitly (SK_IPV4 or SK_IPV6) or implicitly (based on saddr, daddr).
* But the specifications have to be consistent.
*/
switch (s->subtype)
{
case 0:
ASSERT(ipa_zero(s->saddr) || ipa_zero(s->daddr) ||
(ipa_is_ip4(s->saddr) == ipa_is_ip4(s->daddr)));
af = (ipa_is_ip4(s->saddr) || ipa_is_ip4(s->daddr)) ? AF_INET : AF_INET6;
break;
case SK_IPV4:
ASSERT(ipa_zero(s->saddr) || ipa_is_ip4(s->saddr));
ASSERT(ipa_zero(s->daddr) || ipa_is_ip4(s->daddr));
af = AF_INET;
break;
case SK_IPV6:
ASSERT(ipa_zero(s->saddr) || !ipa_is_ip4(s->saddr));
ASSERT(ipa_zero(s->daddr) || !ipa_is_ip4(s->daddr));
af = AF_INET6;
break;
default:
bug("Invalid subtype %d", s->subtype);
}
}
switch (s->type)
{
case SK_TCP_ACTIVE:
s->ttx = ""; /* Force s->ttx != s->tpos */
/* Fall thru */
case SK_TCP_PASSIVE:
fd = socket(fam_to_af[s->fam], SOCK_STREAM, IPPROTO_TCP);
fd = socket(af, SOCK_STREAM, IPPROTO_TCP);
bind_port = s->sport;
bind_addr = s->saddr;
do_bind = bind_port || ipa_nonzero(bind_addr);
break;
case SK_UDP:
fd = socket(fam_to_af[s->fam], SOCK_DGRAM, IPPROTO_UDP);
fd = socket(af, SOCK_DGRAM, IPPROTO_UDP);
bind_port = s->sport;
bind_addr = (s->flags & SKF_BIND) ? s->saddr : IPA_NONE;
do_bind = 1;
break;
case SK_IP:
fd = socket(fam_to_af[s->fam], SOCK_RAW, s->dport);
fd = socket(af, SOCK_RAW, s->dport);
bind_port = 0;
bind_addr = (s->flags & SKF_BIND) ? s->saddr : IPA_NONE;
do_bind = ipa_nonzero(bind_addr);
break;
case SK_MAGIC:
s->fam = SK_FAM_NONE;
af = 0;
fd = s->fd;
break;
@ -1412,6 +1444,7 @@ sk_open(sock *s)
if (fd < 0)
ERR("socket");
s->af = af;
s->fd = fd;
if (sk_setup(s) < 0)
@ -1440,7 +1473,7 @@ sk_open(sock *s)
if (sk_set_high_port(s) < 0)
log(L_WARN "Socket error: %s%#m", s->err);
sockaddr_fill(&sa, fam_to_af[s->fam], bind_addr, s->iface, bind_port);
sockaddr_fill(&sa, s->af, bind_addr, s->iface, bind_port);
if (bind(fd, &sa.sa, SA_LEN(sa)) < 0)
ERR2("bind");
}
@ -1452,7 +1485,7 @@ sk_open(sock *s)
switch (s->type)
{
case SK_TCP_ACTIVE:
sockaddr_fill(&sa, fam_to_af[s->fam], s->daddr, s->iface, s->dport);
sockaddr_fill(&sa, s->af, s->daddr, s->iface, s->dport);
if (connect(fd, &sa.sa, SA_LEN(sa)) >= 0)
sk_tcp_connected(s);
else if (errno != EINTR && errno != EAGAIN && errno != EINPROGRESS &&
@ -1559,7 +1592,7 @@ sk_sendmsg(sock *s)
byte cmsg_buf[CMSG_TX_SPACE];
sockaddr dst;
sockaddr_fill(&dst, fam_to_af[s->fam], s->daddr, s->iface, s->dport);
sockaddr_fill(&dst, s->af, s->daddr, s->iface, s->dport);
struct msghdr msg = {
.msg_name = &dst.sa,
@ -1612,7 +1645,7 @@ sk_recvmsg(sock *s)
// rv = ipv4_skip_header(pbuf, rv);
//endif
sockaddr_read(&src, fam_to_af[s->fam], &s->faddr, NULL, &s->fport);
sockaddr_read(&src, s->af, &s->faddr, NULL, &s->fport);
sk_process_cmsgs(s, &msg);
if (msg.msg_flags & MSG_TRUNC)
@ -1832,7 +1865,7 @@ sk_write(sock *s)
case SK_TCP_ACTIVE:
{
sockaddr sa;
sockaddr_fill(&sa, fam_to_af[s->fam], s->daddr, s->iface, s->dport);
sockaddr_fill(&sa, s->af, s->daddr, s->iface, s->dport);
if (connect(s->fd, &sa.sa, SA_LEN(sa)) >= 0 || errno == EISCONN)
sk_tcp_connected(s);
@ -1853,10 +1886,10 @@ sk_write(sock *s)
}
int sk_is_ipv4(sock *s)
{ return s->fam == SK_FAM_IPV4; }
{ return s->af == AF_INET; }
int sk_is_ipv6(sock *s)
{ return s->fam == SK_FAM_IPV6; }
{ return s->af == AF_INET6; }
void
sk_dump_all(void)

2
sysdep/unix/unix.h
View File

@ -102,8 +102,6 @@ int sk_open_unix(struct birdsock *s, char *name);
void *tracked_fopen(struct pool *, char *name, char *mode);
void test_old_bird(char *path);
extern const int fam_to_af[];
/* krt.c bits */
void krt_io_init(void);