/*
* Copyright (C) Roman Arutyunyan
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_event_quic_connection.h>
static void ngx_quic_close_accepted_connection(ngx_connection_t *c);
static ngx_connection_t *ngx_quic_lookup_connection(ngx_listening_t *ls,
ngx_str_t *key, struct sockaddr *local_sockaddr, socklen_t local_socklen);
void
ngx_quic_recvmsg(ngx_event_t *ev)
{
ssize_t n;
ngx_str_t key;
ngx_buf_t buf;
ngx_log_t *log;
ngx_err_t err;
socklen_t socklen, local_socklen;
ngx_event_t *rev, *wev;
struct iovec iov[1];
struct msghdr msg;
ngx_sockaddr_t sa, lsa;
struct sockaddr *sockaddr, *local_sockaddr;
ngx_listening_t *ls;
ngx_event_conf_t *ecf;
ngx_connection_t *c, *lc;
ngx_quic_socket_t *qsock;
static u_char buffer[NGX_QUIC_MAX_UDP_PAYLOAD_SIZE];
#if (NGX_HAVE_ADDRINFO_CMSG)
u_char msg_control[CMSG_SPACE(sizeof(ngx_addrinfo_t))];
#endif
if (ev->timedout) {
if (ngx_enable_accept_events((ngx_cycle_t *) ngx_cycle) != NGX_OK) {
return;
}
ev->timedout = 0;
}
ecf = ngx_event_get_conf(ngx_cycle->conf_ctx, ngx_event_core_module);
if (!(ngx_event_flags & NGX_USE_KQUEUE_EVENT)) {
ev->available = ecf->multi_accept;
}
lc = ev->data;
ls = lc->listening;
ev->ready = 0;
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"quic recvmsg on %V, ready: %d",
&ls->addr_text, ev->available);
do {
ngx_memzero(&msg, sizeof(struct msghdr));
iov[0].iov_base = (void *) buffer;
iov[0].iov_len = sizeof(buffer);
msg.msg_name = &sa;
msg.msg_namelen = sizeof(ngx_sockaddr_t);
msg.msg_iov = iov;
msg.msg_iovlen = 1;
#if (NGX_HAVE_ADDRINFO_CMSG)
if (ls->wildcard) {
msg.msg_control = &msg_control;
msg.msg_controllen = sizeof(msg_control);
ngx_memzero(&msg_control, sizeof(msg_control));
}
#endif
n = recvmsg(lc->fd, &msg, 0);
if (n == -1) {
err = ngx_socket_errno;
if (err == NGX_EAGAIN) {
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ev->log, err,
"quic recvmsg() not ready");
return;
}
ngx_log_error(NGX_LOG_ALERT, ev->log, err, "quic recvmsg() failed");
return;
}
#if (NGX_HAVE_ADDRINFO_CMSG)
if (msg.msg_flags & (MSG_TRUNC|MSG_CTRUNC)) {
ngx_log_error(NGX_LOG_ALERT, ev->log, 0,
"quic recvmsg() truncated data");
continue;
}
#endif
sockaddr = msg.msg_name;
socklen = msg.msg_namelen;
if (socklen > (socklen_t) sizeof(ngx_sockaddr_t)) {
socklen = sizeof(ngx_sockaddr_t);
}
#if (NGX_HAVE_UNIX_DOMAIN)
if (sockaddr->sa_family == AF_UNIX) {
struct sockaddr_un *saun = (struct sockaddr_un *) sockaddr;
if (socklen <= (socklen_t) offsetof(struct sockaddr_un, sun_path)
|| saun->sun_path[0] == '\0')
{
ngx_log_debug0(NGX_LOG_DEBUG_EVENT, ngx_cycle->log, 0,
"unbound unix socket");
goto next;
}
}
#endif
local_sockaddr = ls->sockaddr;
local_socklen = ls->socklen;
#if (NGX_HAVE_ADDRINFO_CMSG)
if (ls->wildcard) {
struct cmsghdr *cmsg;
ngx_memcpy(&lsa, local_sockaddr, local_socklen);
local_sockaddr = &lsa.sockaddr;
for (cmsg = CMSG_FIRSTHDR(&msg);
cmsg != NULL;
cmsg = CMSG_NXTHDR(&msg, cmsg))
{
if (ngx_get_srcaddr_cmsg(cmsg, local_sockaddr) == NGX_OK) {
break;
}
}
}
#endif
if (ngx_quic_get_packet_dcid(ev->log, buffer, n, &key) != NGX_OK) {
goto next;
}
c = ngx_quic_lookup_connection(ls, &key, local_sockaddr, local_socklen);
if (c) {
#if (NGX_DEBUG)
if (c->log->log_level & NGX_LOG_DEBUG_EVENT) {
ngx_log_handler_pt handler;
handler = c->log->handler;
c->log->handler = NULL;
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, c->log, 0,
"quic recvmsg: fd:%d n:%z", c->fd, n);
c->log->handler = handler;
}
#endif
ngx_memzero(&buf, sizeof(ngx_buf_t));
buf.pos = buffer;
buf.last = buffer + n;
buf.start = buf.pos;
buf.end = buffer + sizeof(buffer);
qsock = ngx_quic_get_socket(c);
ngx_memcpy(&qsock->sockaddr, sockaddr, socklen);
qsock->socklen = socklen;
c->udp->buffer = &buf;
rev = c->read;
rev->ready = 1;
rev->active = 0;
rev->handler(rev);
if (c->udp) {
c->udp->buffer = NULL;
}
rev->ready = 0;
rev->active = 1;
goto next;
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_accepted, 1);
#endif
ngx_accept_disabled = ngx_cycle->connection_n / 8
- ngx_cycle->free_connection_n;
c = ngx_get_connection(lc->fd, ev->log);
if (c == NULL) {
return;
}
c->shared = 1;
c->type = SOCK_DGRAM;
c->socklen = socklen;
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, 1);
#endif
c->pool = ngx_create_pool(ls->pool_size, ev->log);
if (c->pool == NULL) {
ngx_quic_close_accepted_connection(c);
return;
}
c->sockaddr = ngx_palloc(c->pool, NGX_SOCKADDRLEN);
if (c->sockaddr == NULL) {
ngx_quic_close_accepted_connection(c);
return;
}
ngx_memcpy(c->sockaddr, sockaddr, socklen);
log = ngx_palloc(c->pool, sizeof(ngx_log_t));
if (log == NULL) {
ngx_quic_close_accepted_connection(c);
return;
}
*log = ls->log;
c->log = log;
c->pool->log = log;
c->listening = ls;
if (local_sockaddr == &lsa.sockaddr) {
local_sockaddr = ngx_palloc(c->pool, local_socklen);
if (local_sockaddr == NULL) {
ngx_quic_close_accepted_connection(c);
return;
}
ngx_memcpy(local_sockaddr, &lsa, local_socklen);
}
c->local_sockaddr = local_sockaddr;
c->local_socklen = local_socklen;
c->buffer = ngx_create_temp_buf(c->pool, n);
if (c->buffer == NULL) {
ngx_quic_close_accepted_connection(c);
return;
}
c->buffer->last = ngx_cpymem(c->buffer->last, buffer, n);
rev = c->read;
wev = c->write;
rev->active = 1;
wev->ready = 1;
rev->log = log;
wev->log = log;
/*
* TODO: MT: - ngx_atomic_fetch_add()
* or protection by critical section or light mutex
*
* TODO: MP: - allocated in a shared memory
* - ngx_atomic_fetch_add()
* or protection by critical section or light mutex
*/
c->number = ngx_atomic_fetch_add(ngx_connection_counter, 1);
c->start_time = ngx_current_msec;
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_handled, 1);
#endif
if (ls->addr_ntop) {
c->addr_text.data = ngx_pnalloc(c->pool, ls->addr_text_max_len);
if (c->addr_text.data == NULL) {
ngx_quic_close_accepted_connection(c);
return;
}
c->addr_text.len = ngx_sock_ntop(c->sockaddr, c->socklen,
c->addr_text.data,
ls->addr_text_max_len, 0);
if (c->addr_text.len == 0) {
ngx_quic_close_accepted_connection(c);
return;
}
}
#if (NGX_DEBUG)
{
ngx_str_t addr;
u_char text[NGX_SOCKADDR_STRLEN];
ngx_debug_accepted_connection(ecf, c);
if (log->log_level & NGX_LOG_DEBUG_EVENT) {
addr.data = text;
addr.len = ngx_sock_ntop(c->sockaddr, c->socklen, text,
NGX_SOCKADDR_STRLEN, 1);
ngx_log_debug4(NGX_LOG_DEBUG_EVENT, log, 0,
"*%uA quic recvmsg: %V fd:%d n:%z",
c->number, &addr, c->fd, n);
}
}
#endif
log->data = NULL;
log->handler = NULL;
ls->handler(c);
next:
if (ngx_event_flags & NGX_USE_KQUEUE_EVENT) {
ev->available -= n;
}
} while (ev->available);
}
static void
ngx_quic_close_accepted_connection(ngx_connection_t *c)
{
ngx_free_connection(c);
c->fd = (ngx_socket_t) -1;
if (c->pool) {
ngx_destroy_pool(c->pool);
}
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, -1);
#endif
}
static ngx_connection_t *
ngx_quic_lookup_connection(ngx_listening_t *ls, ngx_str_t *key,
struct sockaddr *local_sockaddr, socklen_t local_socklen)
{
uint32_t hash;
ngx_int_t rc;
ngx_connection_t *c;
ngx_rbtree_node_t *node, *sentinel;
ngx_quic_socket_t *qsock;
if (key->len == 0) {
return NULL;
}
node = ls->rbtree.root;
sentinel = ls->rbtree.sentinel;
hash = ngx_crc32_long(key->data, key->len);
while (node != sentinel) {
if (hash < node->key) {
node = node->left;
continue;
}
if (hash > node->key) {
node = node->right;
continue;
}
/* hash == node->key */
qsock = (ngx_quic_socket_t *) node;
rc = ngx_memn2cmp(key->data, qsock->sid.id, key->len, qsock->sid.len);
c = qsock->udp.connection;
if (rc == 0 && ls->wildcard) {
rc = ngx_cmp_sockaddr(local_sockaddr, local_socklen,
c->local_sockaddr, c->local_socklen, 1);
}
if (rc == 0) {
c->udp = &qsock->udp;
return c;
}
node = (rc < 0) ? node->left : node->right;
}
return NULL;
}
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