Date: Sat, 13 Dec 2008 22:04:52 +0000 (UTC) From: "Bjoern A. Zeeb" <bz@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r186058 - head/sys/contrib/pf/net Message-ID: <200812132204.mBDM4qef040950@svn.freebsd.org>
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Author: bz Date: Sat Dec 13 22:04:52 2008 New Revision: 186058 URL: http://svn.freebsd.org/changeset/base/186058 Log: Like for tcp_subr.c in r186057 make the MD5 context a function local variable in this copy of the code[1]. While here prefix the variables with 'pf_' to avoid file static global variables with colliding names that are or will be virtualized. Discussed with: rwatson, silby [1] Modified: head/sys/contrib/pf/net/pf_subr.c Modified: head/sys/contrib/pf/net/pf_subr.c ============================================================================== --- head/sys/contrib/pf/net/pf_subr.c Sat Dec 13 21:59:18 2008 (r186057) +++ head/sys/contrib/pf/net/pf_subr.c Sat Dec 13 22:04:52 2008 (r186058) @@ -116,22 +116,22 @@ __FBSDID("$FreeBSD$"); #define ISN_STATIC_INCREMENT 4096 #define ISN_RANDOM_INCREMENT (4096 - 1) -static u_char isn_secret[32]; -static int isn_last_reseed; -static u_int32_t isn_offset; -static MD5_CTX isn_ctx; +static u_char pf_isn_secret[32]; +static int pf_isn_last_reseed; +static u_int32_t pf_isn_offset; u_int32_t pf_new_isn(struct pf_state *s) { + MD5_CTX isn_ctx; u_int32_t md5_buffer[4]; u_int32_t new_isn; struct pf_state_host *src, *dst; /* Seed if this is the first use, reseed if requested. */ - if (isn_last_reseed == 0) { - read_random(&isn_secret, sizeof(isn_secret)); - isn_last_reseed = ticks; + if (pf_isn_last_reseed == 0) { + read_random(&pf_isn_secret, sizeof(pf_isn_secret)); + pf_isn_last_reseed = ticks; } if (s->direction == PF_IN) { @@ -160,11 +160,11 @@ pf_new_isn(struct pf_state *s) MD5Update(&isn_ctx, (u_char *) &src->addr, sizeof(struct in_addr)); } - MD5Update(&isn_ctx, (u_char *) &isn_secret, sizeof(isn_secret)); + MD5Update(&isn_ctx, (u_char *) &pf_isn_secret, sizeof(pf_isn_secret)); MD5Final((u_char *) &md5_buffer, &isn_ctx); new_isn = (tcp_seq) md5_buffer[0]; - isn_offset += ISN_STATIC_INCREMENT + + pf_isn_offset += ISN_STATIC_INCREMENT + (arc4random() & ISN_RANDOM_INCREMENT); - new_isn += isn_offset; + new_isn += pf_isn_offset; return (new_isn); }
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