Mercurial > hg > nginx
view src/stream/ngx_stream_write_filter_module.c @ 8971:1e2f4e9c8195 quic
QUIC: reworked migration handling.
The quic connection now holds active, backup and probe paths instead
of sockets. The number of migration paths is now limited and cannot
be inflated by a bad client or an attacker.
The client id is now associated with path rather than socket. This allows
to simplify processing of output and connection ids handling.
New migration abandons any previously started migrations. This allows to
free consumed client ids and request new for use in future migrations and
make progress in case when connection id limit is hit during migration.
A path now can be revalidated without losing its state.
The patch also fixes various issues with NAT rebinding case handling:
- paths are now validated (previously, there was no validation
and paths were left in limited state)
- attempt to reuse id on different path is now again verified
(this was broken in 40445fc7c403)
- former path is now validated in case of apparent migration
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Wed, 19 Jan 2022 22:39:24 +0300 |
parents | d127837c714f |
children | 32b0ba4855a6 |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_stream.h> typedef struct { ngx_chain_t *from_upstream; ngx_chain_t *from_downstream; } ngx_stream_write_filter_ctx_t; static ngx_int_t ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in, ngx_uint_t from_upstream); static ngx_int_t ngx_stream_write_filter_init(ngx_conf_t *cf); static ngx_stream_module_t ngx_stream_write_filter_module_ctx = { NULL, /* preconfiguration */ ngx_stream_write_filter_init, /* postconfiguration */ NULL, /* create main configuration */ NULL, /* init main configuration */ NULL, /* create server configuration */ NULL /* merge server configuration */ }; ngx_module_t ngx_stream_write_filter_module = { NGX_MODULE_V1, &ngx_stream_write_filter_module_ctx, /* module context */ NULL, /* module directives */ NGX_STREAM_MODULE, /* module type */ NULL, /* init master */ NULL, /* init module */ NULL, /* init process */ NULL, /* init thread */ NULL, /* exit thread */ NULL, /* exit process */ NULL, /* exit master */ NGX_MODULE_V1_PADDING }; static ngx_int_t ngx_stream_write_filter(ngx_stream_session_t *s, ngx_chain_t *in, ngx_uint_t from_upstream) { off_t size; ngx_uint_t last, flush, sync; ngx_chain_t *cl, *ln, **ll, **out, *chain; ngx_connection_t *c; ngx_stream_write_filter_ctx_t *ctx; ctx = ngx_stream_get_module_ctx(s, ngx_stream_write_filter_module); if (ctx == NULL) { ctx = ngx_pcalloc(s->connection->pool, sizeof(ngx_stream_write_filter_ctx_t)); if (ctx == NULL) { return NGX_ERROR; } ngx_stream_set_ctx(s, ctx, ngx_stream_write_filter_module); } if (from_upstream) { c = s->connection; out = &ctx->from_upstream; } else { c = s->upstream->peer.connection; out = &ctx->from_downstream; } if (c->error) { return NGX_ERROR; } size = 0; flush = 0; sync = 0; last = 0; ll = out; /* find the size, the flush point and the last link of the saved chain */ for (cl = *out; cl; cl = cl->next) { ll = &cl->next; ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, "write old buf t:%d f:%d %p, pos %p, size: %z " "file: %O, size: %O", cl->buf->temporary, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last - cl->buf->pos, cl->buf->file_pos, cl->buf->file_last - cl->buf->file_pos); if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { ngx_log_error(NGX_LOG_ALERT, c->log, 0, "zero size buf in writer " "t:%d r:%d f:%d %p %p-%p %p %O-%O", cl->buf->temporary, cl->buf->recycled, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last, cl->buf->file, cl->buf->file_pos, cl->buf->file_last); ngx_debug_point(); return NGX_ERROR; } if (ngx_buf_size(cl->buf) < 0) { ngx_log_error(NGX_LOG_ALERT, c->log, 0, "negative size buf in writer " "t:%d r:%d f:%d %p %p-%p %p %O-%O", cl->buf->temporary, cl->buf->recycled, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last, cl->buf->file, cl->buf->file_pos, cl->buf->file_last); ngx_debug_point(); return NGX_ERROR; } size += ngx_buf_size(cl->buf); if (cl->buf->flush || cl->buf->recycled) { flush = 1; } if (cl->buf->sync) { sync = 1; } if (cl->buf->last_buf) { last = 1; } } /* add the new chain to the existent one */ for (ln = in; ln; ln = ln->next) { cl = ngx_alloc_chain_link(c->pool); if (cl == NULL) { return NGX_ERROR; } cl->buf = ln->buf; *ll = cl; ll = &cl->next; ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, "write new buf t:%d f:%d %p, pos %p, size: %z " "file: %O, size: %O", cl->buf->temporary, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last - cl->buf->pos, cl->buf->file_pos, cl->buf->file_last - cl->buf->file_pos); if (ngx_buf_size(cl->buf) == 0 && !ngx_buf_special(cl->buf)) { ngx_log_error(NGX_LOG_ALERT, c->log, 0, "zero size buf in writer " "t:%d r:%d f:%d %p %p-%p %p %O-%O", cl->buf->temporary, cl->buf->recycled, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last, cl->buf->file, cl->buf->file_pos, cl->buf->file_last); ngx_debug_point(); return NGX_ERROR; } if (ngx_buf_size(cl->buf) < 0) { ngx_log_error(NGX_LOG_ALERT, c->log, 0, "negative size buf in writer " "t:%d r:%d f:%d %p %p-%p %p %O-%O", cl->buf->temporary, cl->buf->recycled, cl->buf->in_file, cl->buf->start, cl->buf->pos, cl->buf->last, cl->buf->file, cl->buf->file_pos, cl->buf->file_last); ngx_debug_point(); return NGX_ERROR; } size += ngx_buf_size(cl->buf); if (cl->buf->flush || cl->buf->recycled) { flush = 1; } if (cl->buf->sync) { sync = 1; } if (cl->buf->last_buf) { last = 1; } } *ll = NULL; ngx_log_debug3(NGX_LOG_DEBUG_STREAM, c->log, 0, "stream write filter: l:%ui f:%ui s:%O", last, flush, size); if (size == 0 && !(c->buffered & NGX_LOWLEVEL_BUFFERED) && !(last && c->need_last_buf) && !(c->type == SOCK_DGRAM && flush)) { if (last || flush || sync) { for (cl = *out; cl; /* void */) { ln = cl; cl = cl->next; ngx_free_chain(c->pool, ln); } *out = NULL; c->buffered &= ~NGX_STREAM_WRITE_BUFFERED; return NGX_OK; } ngx_log_error(NGX_LOG_ALERT, c->log, 0, "the stream output chain is empty"); ngx_debug_point(); return NGX_ERROR; } chain = c->send_chain(c, *out, 0); ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0, "stream write filter %p", chain); if (chain == NGX_CHAIN_ERROR) { c->error = 1; return NGX_ERROR; } for (cl = *out; cl && cl != chain; /* void */) { ln = cl; cl = cl->next; ngx_free_chain(c->pool, ln); } *out = chain; if (chain) { if (c->shared) { ngx_log_error(NGX_LOG_ALERT, c->log, 0, "shared connection is busy"); return NGX_ERROR; } c->buffered |= NGX_STREAM_WRITE_BUFFERED; return NGX_AGAIN; } c->buffered &= ~NGX_STREAM_WRITE_BUFFERED; if (c->buffered & NGX_LOWLEVEL_BUFFERED) { return NGX_AGAIN; } return NGX_OK; } static ngx_int_t ngx_stream_write_filter_init(ngx_conf_t *cf) { ngx_stream_top_filter = ngx_stream_write_filter; return NGX_OK; }