From owner-freebsd-questions  Wed Aug 29  0:14:59 2001
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Date: Wed, 29 Aug 2001 10:14:16 +0300
From: Ruslan Ermilov <ru@FreeBSD.ORG>
To: Anuranjan <anu@nttmcl.com>
Cc: questions@FreeBSD.ORG
Subject: Re: very urgent : trying to add a route to kernel table
Message-ID: <20010829101416.B70541@sunbay.com>
References: <001901c13026$f0aaf230$f64545d8@ntt27f48otgmw8>
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In-Reply-To: <001901c13026$f0aaf230$f64545d8@ntt27f48otgmw8>; from anu@nttmcl.com on Tue, Aug 28, 2001 at 06:07:13PM -0700
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Your program is equivalent of doing:

# route add 4.5.6.7
route: writing to routing socket: Invalid argument
add host 4.5.6.7: Invalid argument

When adding a route, you should also specify a gateway (RTA_GATEWAY).

On Tue, Aug 28, 2001 at 06:07:13PM -0700, Anuranjan wrote:
> Hi,
> I'm trying to add an entry into the kernel routing table (my first time).
> Don't know what I'm doing wrong ... but when I try "RTM_DELETE" it works ..
> only RTM_ADD doesn't (errno says EINVAL) ... any suggestions ? Am attaching
> the code snippet here..
> 
> --Anu
> 
> ----------------------------------------------------------------------------
> ----------------------------------------------------------------------------
> ------------------------------
> 
> process_pkt_info(char *srcIPaddr, char *dstIPaddr, int src_if_id)
> {
> 	int err;
> 	struct sockaddr_in *s;
> 	int sockfd, rtsockfd;
> 	char *buf;
> 	pid_t pid;
> 	ssize_t n;
> 	struct rt_msghdr *rtm;
> 	struct sockaddr *sa, rti_info[RTAX_MAX];
> 
> 
> 	rtsockfd = socket(AF_ROUTE, SOCK_RAW, 0);
> 
> 	buf = (char *)calloc(1, BUFLEN);
> 	if(buf < 0)
> 	{
> 		printf("calloc failed");
> 		abort();
> 	}
> 
> 	rtm = (struct rt_msghdr *)buf;
> 	rtm->rtm_msglen = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in);
> rtm->rtm_version = RTM_VERSION;
> 	rtm->rtm_type = RTM_ADD;
> 	rtm->rtm_addrs = RTA_DST;
> 	rtm->rtm_pid = pid = getpid();
> 	rtm->rtm_seq = SEQ;
> 
> 	s = (struct sockaddr_in *) (rtm + 1);
> 	s->sin_len = sizeof(struct sockaddr_in);
> 	s->sin_family = AF_INET;
> 	s->sin_addr.s_addr = inet_addr(srcIPaddr);
> 
> 	fwd_enable(1);
> 
> 	if(write(rtsockfd, rtm, rtm->rtm_msglen) < 0 )
> 	{
> 		printf ("error: %d\n", errno);
> 	}
> 
> }
> 
> int main (void)
> {	
> 	process_pkt_info("4.5.6.7", NULL, 2);
> 	return(0);
> }
> 
> 
> To Unsubscribe: send mail to majordomo@FreeBSD.org
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-- 
Ruslan Ermilov		Oracle Developer/DBA,
ru@sunbay.com		Sunbay Software AG,
ru@FreeBSD.org		FreeBSD committer,
+380.652.512.251	Simferopol, Ukraine

http://www.FreeBSD.org	The Power To Serve
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