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UDP: extended datagram context.

Browse source 
Sometimes it is required to process datagram properties at higher level (i.e.
QUIC is interested in source address which may change and IP options).  The
patch adds ngx_udp_dgram_t structure used to pass packet-related information
in c->udp.
This commit is contained in:
Vladimir Homutov 2021-04-02 18:58:19 +03:00
parent d9e4f8e288
commit f3489441b2
3 changed files with 34 additions and 30 deletions
Download patch file Download diff file Expand all files Collapse all files

9
src/event/ngx_event.h
View file

@ -169,11 +169,18 @@ struct ngx_event_aio_s {
#if !(NGX_WIN32)
typedef struct {
ngx_buf_t *buffer;
struct sockaddr *sockaddr;
socklen_t socklen;
} ngx_udp_dgram_t;
struct ngx_udp_connection_s {
ngx_rbtree_node_t node;
ngx_connection_t *connection;
ngx_str_t key;
ngx_buf_t *buffer;
ngx_udp_dgram_t *dgram;
};
#endif

53
src/event/ngx_event_udp.c
View file

@ -29,12 +29,13 @@ ngx_event_recvmsg(ngx_event_t *ev)
ngx_buf_t buf;
ngx_log_t *log;
ngx_err_t err;
socklen_t socklen, local_socklen;
socklen_t 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_udp_dgram_t dgram;
struct sockaddr *local_sockaddr;
ngx_listening_t *ls;
ngx_event_conf_t *ecf;
ngx_connection_t *c, *lc;
@ -131,21 +132,21 @@ ngx_event_recvmsg(ngx_event_t *ev)
}
#endif
sockaddr = msg.msg_name;
socklen = msg.msg_namelen;
dgram.sockaddr = msg.msg_name;
dgram.socklen = msg.msg_namelen;
if (socklen > (socklen_t) sizeof(ngx_sockaddr_t)) {
socklen = sizeof(ngx_sockaddr_t);
if (dgram.socklen > (socklen_t) sizeof(ngx_sockaddr_t)) {
dgram.socklen = sizeof(ngx_sockaddr_t);
}
if (socklen == 0) {
if (dgram.socklen == 0) {
/*
* on Linux recvmsg() returns zero msg_namelen
* when receiving packets from unbound AF_UNIX sockets
*/
socklen = sizeof(struct sockaddr);
dgram.socklen = sizeof(struct sockaddr);
ngx_memzero(&sa, sizeof(struct sockaddr));
sa.sockaddr.sa_family = ls->sockaddr->sa_family;
}
@ -223,15 +224,16 @@ ngx_event_recvmsg(ngx_event_t *ev)
#endif
key.data = (u_char *) sockaddr;
key.len = socklen;
key.data = (u_char *) dgram.sockaddr;
key.len = dgram.socklen;
#if (NGX_HAVE_UNIX_DOMAIN)
if (sockaddr->sa_family == AF_UNIX) {
struct sockaddr_un *saun = (struct sockaddr_un *) sockaddr;
if (dgram.sockaddr->sa_family == AF_UNIX) {
struct sockaddr_un *saun = (struct sockaddr_un *) dgram.sockaddr;
if (socklen <= (socklen_t) offsetof(struct sockaddr_un, sun_path)
if (dgram.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,
@ -268,13 +270,6 @@ ngx_event_recvmsg(ngx_event_t *ev)
}
#endif
#if (NGX_QUIC)
if (ls->quic) {
c->socklen = socklen;
ngx_memcpy(c->sockaddr, sockaddr, socklen);
}
#endif
ngx_memzero(&buf, sizeof(ngx_buf_t));
buf.pos = buffer;
@ -284,7 +279,9 @@ ngx_event_recvmsg(ngx_event_t *ev)
rev = c->read;
c->udp->buffer = &buf;
dgram.buffer = &buf;
c->udp->dgram = &dgram;
rev->ready = 1;
rev->active = 0;
@ -292,7 +289,7 @@ ngx_event_recvmsg(ngx_event_t *ev)
rev->handler(rev);
if (c->udp) {
c->udp->buffer = NULL;
c->udp->dgram = NULL;
}
rev->ready = 0;
@ -315,7 +312,7 @@ ngx_event_recvmsg(ngx_event_t *ev)
c->shared = 1;
c->type = SOCK_DGRAM;
c->socklen = socklen;
c->socklen = dgram.socklen;
#if (NGX_STAT_STUB)
(void) ngx_atomic_fetch_add(ngx_stat_active, 1);
@ -327,7 +324,7 @@ ngx_event_recvmsg(ngx_event_t *ev)
return;
}
len = socklen;
len = dgram.socklen;
#if (NGX_QUIC)
if (ls->quic) {
@ -341,7 +338,7 @@ ngx_event_recvmsg(ngx_event_t *ev)
return;
}
ngx_memcpy(c->sockaddr, sockaddr, socklen);
ngx_memcpy(c->sockaddr, dgram.sockaddr, dgram.socklen);
log = ngx_palloc(c->pool, sizeof(ngx_log_t));
if (log == NULL) {
@ -483,17 +480,17 @@ ngx_udp_shared_recv(ngx_connection_t *c, u_char *buf, size_t size)
ssize_t n;
ngx_buf_t *b;
if (c->udp == NULL || c->udp->buffer == NULL) {
if (c->udp == NULL || c->udp->dgram == NULL) {
return NGX_AGAIN;
}
b = c->udp->buffer;
b = c->udp->dgram->buffer;
n = ngx_min(b->last - b->pos, (ssize_t) size);
ngx_memcpy(buf, b->pos, n);
c->udp->buffer = NULL;
c->udp->dgram = NULL;
c->read->ready = 0;
c->read->active = 1;

2
src/event/quic/ngx_event_quic.c
View file

@ -1920,7 +1920,7 @@ ngx_quic_input_handler(ngx_event_t *rev)
}
}
b = c->udp->buffer;
b = c->udp->dgram->buffer;
qc->received += (b->last - b->pos);