udp_flow: move all udp_flow functions to udp_flow.c
No code change. They need to be exported to be available by the vhost-user version of passt. Signed-off-by: Laurent Vivier <lvivier@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Laurent Vivier
Stefano Brivio
parent
623ceb1f2b
commit
e877f905e5
4 changed files with 284 additions and 261 deletions
2
Makefile
2
Makefile
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@ -47,7 +47,7 @@ FLAGS += -DDUAL_STACK_SOCKETS=$(DUAL_STACK_SOCKETS)
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PASST_SRCS = arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c flow.c fwd.c \
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icmp.c igmp.c inany.c iov.c ip.c isolation.c lineread.c log.c mld.c \
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ndp.c netlink.c packet.c passt.c pasta.c pcap.c pif.c tap.c tcp.c \
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tcp_buf.c tcp_splice.c udp.c util.c
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tcp_buf.c tcp_splice.c udp.c udp_flow.c util.c
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QRAP_SRCS = qrap.c
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SRCS = $(PASST_SRCS) $(QRAP_SRCS)
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260
udp.c
260
udp.c
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@ -95,7 +95,6 @@
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#include <sys/socket.h>
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#include <sys/uio.h>
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#include <time.h>
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#include <fcntl.h>
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#include <arpa/inet.h>
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#include <linux/errqueue.h>
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@ -111,7 +110,6 @@
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#include "log.h"
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#include "flow_table.h"
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#define UDP_CONN_TIMEOUT 180 /* s, timeout for ephemeral or local bind */
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#define UDP_MAX_FRAMES 32 /* max # of frames to receive at once */
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/* "Spliced" sockets indexed by bound port (host order) */
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@ -276,199 +274,6 @@ static void udp_iov_init(const struct ctx *c)
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udp_iov_init_one(c, i);
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}
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/**
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* udp_at_sidx() - Get UDP specific flow at given sidx
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* @sidx: Flow and side to retrieve
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*
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* Return: UDP specific flow at @sidx, or NULL of @sidx is invalid. Asserts if
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* the flow at @sidx is not FLOW_UDP.
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*/
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struct udp_flow *udp_at_sidx(flow_sidx_t sidx)
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{
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union flow *flow = flow_at_sidx(sidx);
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if (!flow)
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return NULL;
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ASSERT(flow->f.type == FLOW_UDP);
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return &flow->udp;
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}
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/*
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* udp_flow_close() - Close and clean up UDP flow
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* @c: Execution context
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* @uflow: UDP flow
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*/
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static void udp_flow_close(const struct ctx *c, struct udp_flow *uflow)
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{
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if (uflow->s[INISIDE] >= 0) {
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/* The listening socket needs to stay in epoll */
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close(uflow->s[INISIDE]);
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uflow->s[INISIDE] = -1;
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}
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if (uflow->s[TGTSIDE] >= 0) {
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/* But the flow specific one needs to be removed */
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epoll_ctl(c->epollfd, EPOLL_CTL_DEL, uflow->s[TGTSIDE], NULL);
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close(uflow->s[TGTSIDE]);
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uflow->s[TGTSIDE] = -1;
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}
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flow_hash_remove(c, FLOW_SIDX(uflow, INISIDE));
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if (!pif_is_socket(uflow->f.pif[TGTSIDE]))
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flow_hash_remove(c, FLOW_SIDX(uflow, TGTSIDE));
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}
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/**
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* udp_flow_new() - Common setup for a new UDP flow
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* @c: Execution context
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* @flow: Initiated flow
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* @s_ini: Initiating socket (or -1)
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* @now: Timestamp
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*
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* Return: UDP specific flow, if successful, NULL on failure
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*/
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static flow_sidx_t udp_flow_new(const struct ctx *c, union flow *flow,
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int s_ini, const struct timespec *now)
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{
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const struct flowside *ini = &flow->f.side[INISIDE];
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struct udp_flow *uflow = NULL;
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const struct flowside *tgt;
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uint8_t tgtpif;
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if (!inany_is_unicast(&ini->eaddr) || ini->eport == 0) {
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flow_trace(flow, "Invalid endpoint to initiate UDP flow");
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goto cancel;
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}
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if (!(tgt = flow_target(c, flow, IPPROTO_UDP)))
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goto cancel;
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tgtpif = flow->f.pif[TGTSIDE];
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uflow = FLOW_SET_TYPE(flow, FLOW_UDP, udp);
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uflow->ts = now->tv_sec;
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uflow->s[INISIDE] = uflow->s[TGTSIDE] = -1;
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if (s_ini >= 0) {
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/* When using auto port-scanning the listening port could go
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* away, so we need to duplicate the socket
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*/
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uflow->s[INISIDE] = fcntl(s_ini, F_DUPFD_CLOEXEC, 0);
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if (uflow->s[INISIDE] < 0) {
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flow_err(uflow,
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"Couldn't duplicate listening socket: %s",
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strerror(errno));
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goto cancel;
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}
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}
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if (pif_is_socket(tgtpif)) {
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struct mmsghdr discard[UIO_MAXIOV] = { 0 };
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union {
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flow_sidx_t sidx;
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uint32_t data;
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} fref = {
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.sidx = FLOW_SIDX(flow, TGTSIDE),
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};
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int rc;
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uflow->s[TGTSIDE] = flowside_sock_l4(c, EPOLL_TYPE_UDP_REPLY,
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tgtpif, tgt, fref.data);
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if (uflow->s[TGTSIDE] < 0) {
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flow_dbg(uflow,
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"Couldn't open socket for spliced flow: %s",
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strerror(errno));
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goto cancel;
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}
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if (flowside_connect(c, uflow->s[TGTSIDE], tgtpif, tgt) < 0) {
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flow_dbg(uflow,
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"Couldn't connect flow socket: %s",
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strerror(errno));
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goto cancel;
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}
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/* It's possible, if unlikely, that we could receive some
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* unrelated packets in between the bind() and connect() of this
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* socket. For now we just discard these. We could consider
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* trying to redirect these to an appropriate handler, if we
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* need to.
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*/
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rc = recvmmsg(uflow->s[TGTSIDE], discard, ARRAY_SIZE(discard),
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MSG_DONTWAIT, NULL);
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if (rc >= ARRAY_SIZE(discard)) {
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flow_dbg(uflow,
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"Too many (%d) spurious reply datagrams", rc);
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goto cancel;
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} else if (rc > 0) {
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flow_trace(uflow,
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"Discarded %d spurious reply datagrams", rc);
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} else if (errno != EAGAIN) {
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flow_err(uflow,
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"Unexpected error discarding datagrams: %s",
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strerror(errno));
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}
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}
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flow_hash_insert(c, FLOW_SIDX(uflow, INISIDE));
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/* If the target side is a socket, it will be a reply socket that knows
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* its own flowside. But if it's tap, then we need to look it up by
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* hash.
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*/
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if (!pif_is_socket(tgtpif))
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flow_hash_insert(c, FLOW_SIDX(uflow, TGTSIDE));
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FLOW_ACTIVATE(uflow);
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return FLOW_SIDX(uflow, TGTSIDE);
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cancel:
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if (uflow)
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udp_flow_close(c, uflow);
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flow_alloc_cancel(flow);
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return FLOW_SIDX_NONE;
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}
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/**
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* udp_flow_from_sock() - Find or create UDP flow for "listening" socket
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* @c: Execution context
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* @ref: epoll reference of the receiving socket
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* @s_in: Source socket address, filled in by recvmmsg()
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* @now: Timestamp
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*
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* #syscalls fcntl
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*
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* Return: sidx for the destination side of the flow for this packet, or
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* FLOW_SIDX_NONE if we couldn't find or create a flow.
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*/
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static flow_sidx_t udp_flow_from_sock(const struct ctx *c, union epoll_ref ref,
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const union sockaddr_inany *s_in,
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const struct timespec *now)
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{
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struct udp_flow *uflow;
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union flow *flow;
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flow_sidx_t sidx;
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ASSERT(ref.type == EPOLL_TYPE_UDP_LISTEN);
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sidx = flow_lookup_sa(c, IPPROTO_UDP, ref.udp.pif, s_in, ref.udp.port);
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if ((uflow = udp_at_sidx(sidx))) {
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uflow->ts = now->tv_sec;
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return flow_sidx_opposite(sidx);
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}
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if (!(flow = flow_alloc())) {
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char sastr[SOCKADDR_STRLEN];
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debug("Couldn't allocate flow for UDP datagram from %s %s",
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pif_name(ref.udp.pif),
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sockaddr_ntop(s_in, sastr, sizeof(sastr)));
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return FLOW_SIDX_NONE;
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}
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flow_initiate_sa(flow, ref.udp.pif, s_in, ref.udp.port);
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return udp_flow_new(c, flow, ref.fd, now);
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}
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/**
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* udp_splice_prepare() - Prepare one datagram for splicing
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* @mmh: Receiving mmsghdr array
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@ -804,53 +609,6 @@ void udp_reply_sock_handler(const struct ctx *c, union epoll_ref ref,
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}
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}
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/**
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* udp_flow_from_tap() - Find or create UDP flow for tap packets
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* @c: Execution context
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* @pif: pif on which the packet is arriving
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* @af: Address family, AF_INET or AF_INET6
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* @saddr: Source address on guest side
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* @daddr: Destination address guest side
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* @srcport: Source port on guest side
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* @dstport: Destination port on guest side
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*
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* Return: sidx for the destination side of the flow for this packet, or
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* FLOW_SIDX_NONE if we couldn't find or create a flow.
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*/
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static flow_sidx_t udp_flow_from_tap(const struct ctx *c,
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uint8_t pif, sa_family_t af,
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const void *saddr, const void *daddr,
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in_port_t srcport, in_port_t dstport,
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const struct timespec *now)
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{
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struct udp_flow *uflow;
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union flow *flow;
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flow_sidx_t sidx;
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ASSERT(pif == PIF_TAP);
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sidx = flow_lookup_af(c, IPPROTO_UDP, pif, af, saddr, daddr,
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srcport, dstport);
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if ((uflow = udp_at_sidx(sidx))) {
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uflow->ts = now->tv_sec;
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return flow_sidx_opposite(sidx);
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}
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if (!(flow = flow_alloc())) {
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char sstr[INET6_ADDRSTRLEN], dstr[INET6_ADDRSTRLEN];
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debug("Couldn't allocate flow for UDP datagram from %s %s:%hu -> %s:%hu",
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pif_name(pif),
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inet_ntop(af, saddr, sstr, sizeof(sstr)), srcport,
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inet_ntop(af, daddr, dstr, sizeof(dstr)), dstport);
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return FLOW_SIDX_NONE;
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}
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flow_initiate_af(flow, PIF_TAP, af, saddr, srcport, daddr, dstport);
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return udp_flow_new(c, flow, -1, now);
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}
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/**
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* udp_tap_handler() - Handle packets from tap
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* @c: Execution context
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@ -1098,24 +856,6 @@ static int udp_port_rebind_outbound(void *arg)
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return 0;
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}
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/**
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* udp_flow_timer() - Handler for timed events related to a given flow
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* @c: Execution context
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* @uflow: UDP flow
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* @now: Current timestamp
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*
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* Return: true if the flow is ready to free, false otherwise
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*/
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bool udp_flow_timer(const struct ctx *c, struct udp_flow *uflow,
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const struct timespec *now)
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{
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if (now->tv_sec - uflow->ts <= UDP_CONN_TIMEOUT)
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return false;
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udp_flow_close(c, uflow);
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return true;
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}
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/**
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* udp_timer() - Scan activity bitmaps for ports with associated timed events
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* @c: Execution context
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274
udp_flow.c
Normal file
274
udp_flow.c
Normal file
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@ -0,0 +1,274 @@
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/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*
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* UDP flow tracking functions
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/uio.h>
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#include "util.h"
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#include "passt.h"
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#include "flow_table.h"
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#define UDP_CONN_TIMEOUT 180 /* s, timeout for ephemeral or local bind */
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/**
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* udp_at_sidx() - Get UDP specific flow at given sidx
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* @sidx: Flow and side to retrieve
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*
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* Return: UDP specific flow at @sidx, or NULL of @sidx is invalid. Asserts if
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* the flow at @sidx is not FLOW_UDP.
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*/
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struct udp_flow *udp_at_sidx(flow_sidx_t sidx)
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{
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union flow *flow = flow_at_sidx(sidx);
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if (!flow)
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return NULL;
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ASSERT(flow->f.type == FLOW_UDP);
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return &flow->udp;
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}
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/*
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* udp_flow_close() - Close and clean up UDP flow
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* @c: Execution context
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* @uflow: UDP flow
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*/
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static void udp_flow_close(const struct ctx *c, struct udp_flow *uflow)
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{
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if (uflow->s[INISIDE] >= 0) {
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/* The listening socket needs to stay in epoll */
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close(uflow->s[INISIDE]);
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uflow->s[INISIDE] = -1;
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}
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if (uflow->s[TGTSIDE] >= 0) {
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/* But the flow specific one needs to be removed */
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epoll_ctl(c->epollfd, EPOLL_CTL_DEL, uflow->s[TGTSIDE], NULL);
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close(uflow->s[TGTSIDE]);
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uflow->s[TGTSIDE] = -1;
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}
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flow_hash_remove(c, FLOW_SIDX(uflow, INISIDE));
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if (!pif_is_socket(uflow->f.pif[TGTSIDE]))
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flow_hash_remove(c, FLOW_SIDX(uflow, TGTSIDE));
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}
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|
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/**
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* udp_flow_new() - Common setup for a new UDP flow
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* @c: Execution context
|
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* @flow: Initiated flow
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* @s_ini: Initiating socket (or -1)
|
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* @now: Timestamp
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*
|
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* Return: UDP specific flow, if successful, NULL on failure
|
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*/
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static flow_sidx_t udp_flow_new(const struct ctx *c, union flow *flow,
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int s_ini, const struct timespec *now)
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{
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const struct flowside *ini = &flow->f.side[INISIDE];
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struct udp_flow *uflow = NULL;
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const struct flowside *tgt;
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uint8_t tgtpif;
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|
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if (!inany_is_unicast(&ini->eaddr) || ini->eport == 0) {
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flow_trace(flow, "Invalid endpoint to initiate UDP flow");
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goto cancel;
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}
|
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|
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if (!(tgt = flow_target(c, flow, IPPROTO_UDP)))
|
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goto cancel;
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tgtpif = flow->f.pif[TGTSIDE];
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|
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uflow = FLOW_SET_TYPE(flow, FLOW_UDP, udp);
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uflow->ts = now->tv_sec;
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uflow->s[INISIDE] = uflow->s[TGTSIDE] = -1;
|
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|
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if (s_ini >= 0) {
|
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/* When using auto port-scanning the listening port could go
|
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* away, so we need to duplicate the socket
|
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*/
|
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uflow->s[INISIDE] = fcntl(s_ini, F_DUPFD_CLOEXEC, 0);
|
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if (uflow->s[INISIDE] < 0) {
|
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flow_err(uflow,
|
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"Couldn't duplicate listening socket: %s",
|
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strerror(errno));
|
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goto cancel;
|
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}
|
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}
|
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|
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if (pif_is_socket(tgtpif)) {
|
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struct mmsghdr discard[UIO_MAXIOV] = { 0 };
|
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union {
|
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flow_sidx_t sidx;
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uint32_t data;
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} fref = {
|
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.sidx = FLOW_SIDX(flow, TGTSIDE),
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};
|
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int rc;
|
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|
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uflow->s[TGTSIDE] = flowside_sock_l4(c, EPOLL_TYPE_UDP_REPLY,
|
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tgtpif, tgt, fref.data);
|
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if (uflow->s[TGTSIDE] < 0) {
|
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flow_dbg(uflow,
|
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"Couldn't open socket for spliced flow: %s",
|
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strerror(errno));
|
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goto cancel;
|
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}
|
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|
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if (flowside_connect(c, uflow->s[TGTSIDE], tgtpif, tgt) < 0) {
|
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flow_dbg(uflow,
|
||||
"Couldn't connect flow socket: %s",
|
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strerror(errno));
|
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goto cancel;
|
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}
|
||||
|
||||
/* It's possible, if unlikely, that we could receive some
|
||||
* unrelated packets in between the bind() and connect() of this
|
||||
* socket. For now we just discard these. We could consider
|
||||
* trying to redirect these to an appropriate handler, if we
|
||||
* need to.
|
||||
*/
|
||||
rc = recvmmsg(uflow->s[TGTSIDE], discard, ARRAY_SIZE(discard),
|
||||
MSG_DONTWAIT, NULL);
|
||||
if (rc >= ARRAY_SIZE(discard)) {
|
||||
flow_dbg(uflow,
|
||||
"Too many (%d) spurious reply datagrams", rc);
|
||||
goto cancel;
|
||||
} else if (rc > 0) {
|
||||
flow_trace(uflow,
|
||||
"Discarded %d spurious reply datagrams", rc);
|
||||
} else if (errno != EAGAIN) {
|
||||
flow_err(uflow,
|
||||
"Unexpected error discarding datagrams: %s",
|
||||
strerror(errno));
|
||||
}
|
||||
}
|
||||
|
||||
flow_hash_insert(c, FLOW_SIDX(uflow, INISIDE));
|
||||
|
||||
/* If the target side is a socket, it will be a reply socket that knows
|
||||
* its own flowside. But if it's tap, then we need to look it up by
|
||||
* hash.
|
||||
*/
|
||||
if (!pif_is_socket(tgtpif))
|
||||
flow_hash_insert(c, FLOW_SIDX(uflow, TGTSIDE));
|
||||
FLOW_ACTIVATE(uflow);
|
||||
|
||||
return FLOW_SIDX(uflow, TGTSIDE);
|
||||
|
||||
cancel:
|
||||
if (uflow)
|
||||
udp_flow_close(c, uflow);
|
||||
flow_alloc_cancel(flow);
|
||||
return FLOW_SIDX_NONE;
|
||||
}
|
||||
|
||||
/**
|
||||
* udp_flow_from_sock() - Find or create UDP flow for "listening" socket
|
||||
* @c: Execution context
|
||||
* @ref: epoll reference of the receiving socket
|
||||
* @s_in: Source socket address, filled in by recvmmsg()
|
||||
* @now: Timestamp
|
||||
*
|
||||
* #syscalls fcntl
|
||||
*
|
||||
* Return: sidx for the destination side of the flow for this packet, or
|
||||
* FLOW_SIDX_NONE if we couldn't find or create a flow.
|
||||
*/
|
||||
flow_sidx_t udp_flow_from_sock(const struct ctx *c, union epoll_ref ref,
|
||||
const union sockaddr_inany *s_in,
|
||||
const struct timespec *now)
|
||||
{
|
||||
struct udp_flow *uflow;
|
||||
union flow *flow;
|
||||
flow_sidx_t sidx;
|
||||
|
||||
ASSERT(ref.type == EPOLL_TYPE_UDP_LISTEN);
|
||||
|
||||
sidx = flow_lookup_sa(c, IPPROTO_UDP, ref.udp.pif, s_in, ref.udp.port);
|
||||
if ((uflow = udp_at_sidx(sidx))) {
|
||||
uflow->ts = now->tv_sec;
|
||||
return flow_sidx_opposite(sidx);
|
||||
}
|
||||
|
||||
if (!(flow = flow_alloc())) {
|
||||
char sastr[SOCKADDR_STRLEN];
|
||||
|
||||
debug("Couldn't allocate flow for UDP datagram from %s %s",
|
||||
pif_name(ref.udp.pif),
|
||||
sockaddr_ntop(s_in, sastr, sizeof(sastr)));
|
||||
return FLOW_SIDX_NONE;
|
||||
}
|
||||
|
||||
flow_initiate_sa(flow, ref.udp.pif, s_in, ref.udp.port);
|
||||
return udp_flow_new(c, flow, ref.fd, now);
|
||||
}
|
||||
|
||||
/**
|
||||
* udp_flow_from_tap() - Find or create UDP flow for tap packets
|
||||
* @c: Execution context
|
||||
* @pif: pif on which the packet is arriving
|
||||
* @af: Address family, AF_INET or AF_INET6
|
||||
* @saddr: Source address on guest side
|
||||
* @daddr: Destination address guest side
|
||||
* @srcport: Source port on guest side
|
||||
* @dstport: Destination port on guest side
|
||||
*
|
||||
* Return: sidx for the destination side of the flow for this packet, or
|
||||
* FLOW_SIDX_NONE if we couldn't find or create a flow.
|
||||
*/
|
||||
flow_sidx_t udp_flow_from_tap(const struct ctx *c,
|
||||
uint8_t pif, sa_family_t af,
|
||||
const void *saddr, const void *daddr,
|
||||
in_port_t srcport, in_port_t dstport,
|
||||
const struct timespec *now)
|
||||
{
|
||||
struct udp_flow *uflow;
|
||||
union flow *flow;
|
||||
flow_sidx_t sidx;
|
||||
|
||||
ASSERT(pif == PIF_TAP);
|
||||
|
||||
sidx = flow_lookup_af(c, IPPROTO_UDP, pif, af, saddr, daddr,
|
||||
srcport, dstport);
|
||||
if ((uflow = udp_at_sidx(sidx))) {
|
||||
uflow->ts = now->tv_sec;
|
||||
return flow_sidx_opposite(sidx);
|
||||
}
|
||||
|
||||
if (!(flow = flow_alloc())) {
|
||||
char sstr[INET6_ADDRSTRLEN], dstr[INET6_ADDRSTRLEN];
|
||||
|
||||
debug("Couldn't allocate flow for UDP datagram from %s %s:%hu -> %s:%hu",
|
||||
pif_name(pif),
|
||||
inet_ntop(af, saddr, sstr, sizeof(sstr)), srcport,
|
||||
inet_ntop(af, daddr, dstr, sizeof(dstr)), dstport);
|
||||
return FLOW_SIDX_NONE;
|
||||
}
|
||||
|
||||
flow_initiate_af(flow, PIF_TAP, af, saddr, srcport, daddr, dstport);
|
||||
|
||||
return udp_flow_new(c, flow, -1, now);
|
||||
}
|
||||
|
||||
/**
|
||||
* udp_flow_timer() - Handler for timed events related to a given flow
|
||||
* @c: Execution context
|
||||
* @uflow: UDP flow
|
||||
* @now: Current timestamp
|
||||
*
|
||||
* Return: true if the flow is ready to free, false otherwise
|
||||
*/
|
||||
bool udp_flow_timer(const struct ctx *c, struct udp_flow *uflow,
|
||||
const struct timespec *now)
|
||||
{
|
||||
if (now->tv_sec - uflow->ts <= UDP_CONN_TIMEOUT)
|
||||
return false;
|
||||
|
||||
udp_flow_close(c, uflow);
|
||||
return true;
|
||||
}
|
||||
|
|
@ -21,6 +21,15 @@ struct udp_flow {
|
|||
int s[SIDES];
|
||||
};
|
||||
|
||||
struct udp_flow *udp_at_sidx(flow_sidx_t sidx);
|
||||
flow_sidx_t udp_flow_from_sock(const struct ctx *c, union epoll_ref ref,
|
||||
const union sockaddr_inany *s_in,
|
||||
const struct timespec *now);
|
||||
flow_sidx_t udp_flow_from_tap(const struct ctx *c,
|
||||
uint8_t pif, sa_family_t af,
|
||||
const void *saddr, const void *daddr,
|
||||
in_port_t srcport, in_port_t dstport,
|
||||
const struct timespec *now);
|
||||
bool udp_flow_timer(const struct ctx *c, struct udp_flow *uflow,
|
||||
const struct timespec *now);
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue